Add placeholder readme to prevent build failure

[dedemorton]

Adds placeholder readme to keep build working after the Elastic Agent docs are deleted.

After we update the conf.yaml, we can remove the readme (or keep it if it's useful).

Replaces #23254 and #23255

[elasticmachine]

Pinging @elastic/ingest-management (Team:Ingest Management)

[elasticmachine]

💔 Build Failed

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Build stats

• Build Cause: Pull request #23256 opened

• Start Time: 2020-12-23T01:39:35.779+0000

• Duration: 19 min 46 sec

Steps errors

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make check

• Took 12 min 3 sec . View more details on here
• Description: make check

Error signal

• Took 0 min 0 sec . View more details on here
• Description: Error 'hudson.AbortException: script returned exit code 2'

Log output

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[2020-12-23T01:58:14.081Z]  Dependency : github.com/gorhill/cronexpr
[2020-12-23T01:58:14.081Z]  Version: v0.0.0-20161205141322-d520615e531a
[2020-12-23T01:58:14.081Z] @@ -30284,43 +30352,6 @@ Contents of probable licence file $GOMODCACHE/github.com/google/subcommands@v1.0
[2020-12-23T01:58:14.081Z]     limitations under the License.
[2020-12-23T01:58:14.081Z]  
[2020-12-23T01:58:14.081Z]  
[2020-12-23T01:58:14.081Z] ---------------------------------------------------------------------------------
[2020-12-23T01:58:14.081Z] -Dependency : github.com/google/uuid
[2020-12-23T01:58:14.081Z] -Version: v1.1.2-0.20190416172445-c2e93f3ae59f
[2020-12-23T01:58:14.081Z] -Licence type (autodetected): BSD-3-Clause
[2020-12-23T01:58:14.081Z] ---------------------------------------------------------------------------------
[2020-12-23T01:58:14.081Z] -
[2020-12-23T01:58:14.081Z] -Contents of probable licence file $GOMODCACHE/github.com/google/uuid@v1.1.2-0.20190416172445-c2e93f3ae59f/LICENSE:
[2020-12-23T01:58:14.081Z] -
[2020-12-23T01:58:14.081Z] -Copyright (c) 2009,2014 Google Inc. All rights reserved.
[2020-12-23T01:58:14.081Z] -
[2020-12-23T01:58:14.081Z] -Redistribution and use in source and binary forms, with or without
[2020-12-23T01:58:14.081Z] -modification, are permitted provided that the following conditions are
[2020-12-23T01:58:14.081Z] -met:
[2020-12-23T01:58:14.081Z] -
[2020-12-23T01:58:14.081Z] -   * Redistributions of source code must retain the above copyright
[2020-12-23T01:58:14.081Z] -notice, this list of conditions and the following disclaimer.
[2020-12-23T01:58:14.081Z] -   * Redistributions in binary form must reproduce the above
[2020-12-23T01:58:14.081Z] -copyright notice, this list of conditions and the following disclaimer
[2020-12-23T01:58:14.081Z] -in the documentation and/or other materials provided with the
[2020-12-23T01:58:14.081Z] -distribution.
[2020-12-23T01:58:14.081Z] -   * Neither the name of Google Inc. nor the names of its
[2020-12-23T01:58:14.081Z] -contributors may be used to endorse or promote products derived from
[2020-12-23T01:58:14.081Z] -this software without specific prior written permission.
[2020-12-23T01:58:14.081Z] -
[2020-12-23T01:58:14.081Z] -THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
[2020-12-23T01:58:14.081Z] -"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
[2020-12-23T01:58:14.081Z] -LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
[2020-12-23T01:58:14.081Z] -A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
[2020-12-23T01:58:14.081Z] -OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
[2020-12-23T01:58:14.081Z] -SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
[2020-12-23T01:58:14.081Z] -LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
[2020-12-23T01:58:14.081Z] -DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
[2020-12-23T01:58:14.081Z] -THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
[2020-12-23T01:58:14.081Z] -(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
[2020-12-23T01:58:14.081Z] -OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
[2020-12-23T01:58:14.081Z] -
[2020-12-23T01:58:14.081Z] -
[2020-12-23T01:58:14.081Z]  --------------------------------------------------------------------------------
[2020-12-23T01:58:14.082Z]  Dependency : github.com/googleapis/gax-go/v2
[2020-12-23T01:58:14.082Z]  Version: v2.0.5
[2020-12-23T01:58:14.082Z] NOTICE.txt: needs update
[2020-12-23T01:58:14.082Z] Makefile:116: recipe for target 'check-no-changes' failed
[2020-12-23T01:58:14.082Z] make[1]: *** [check-no-changes] Error 1
[2020-12-23T01:58:14.082Z] make[1]: Leaving directory '/var/lib/jenkins/workspace/Beats_beats_PR-23256/src/github.com/elastic/beats'
[2020-12-23T01:58:14.082Z] Makefile:98: recipe for target 'check' failed
[2020-12-23T01:58:14.082Z] make: *** [check] Error 2
[2020-12-23T01:58:14.429Z] Client: Docker Engine - Community
[2020-12-23T01:58:14.429Z]  Version:           20.10.1
[2020-12-23T01:58:14.429Z]  API version:       1.41
[2020-12-23T01:58:14.429Z]  Go version:        go1.13.15
[2020-12-23T01:58:14.429Z]  Git commit:        831ebea
[2020-12-23T01:58:14.429Z]  Built:             Tue Dec 15 04:34:59 2020
[2020-12-23T01:58:14.429Z]  OS/Arch:           linux/amd64
[2020-12-23T01:58:14.429Z]  Context:           default
[2020-12-23T01:58:14.429Z]  Experimental:      true
[2020-12-23T01:58:14.429Z] 
[2020-12-23T01:58:14.429Z] Server: Docker Engine - Community
[2020-12-23T01:58:14.429Z]  Engine:
[2020-12-23T01:58:14.429Z]   Version:          20.10.1
[2020-12-23T01:58:14.429Z]   API version:      1.41 (minimum version 1.12)
[2020-12-23T01:58:14.429Z]   Go version:       go1.13.15
[2020-12-23T01:58:14.429Z]   Git commit:       f001486
[2020-12-23T01:58:14.429Z]   Built:            Tue Dec 15 04:32:40 2020
[2020-12-23T01:58:14.429Z]   OS/Arch:          linux/amd64
[2020-12-23T01:58:14.429Z]   Experimental:     false
[2020-12-23T01:58:14.429Z]  containerd:
[2020-12-23T01:58:14.429Z]   Version:          1.4.3
[2020-12-23T01:58:14.429Z]   GitCommit:        269548fa27e0089a8b8278fc4fc781d7f65a939b
[2020-12-23T01:58:14.429Z]  runc:
[2020-12-23T01:58:14.429Z]   Version:          1.0.0-rc92
[2020-12-23T01:58:14.429Z]   GitCommit:        ff819c7e9184c13b7c2607fe6c30ae19403a7aff
[2020-12-23T01:58:14.429Z]  docker-init:
[2020-12-23T01:58:14.430Z]   Version:          0.19.0
[2020-12-23T01:58:14.430Z]   GitCommit:        de40ad0
[2020-12-23T01:58:14.430Z] Unable to find image 'alpine:3.4' locally
[2020-12-23T01:58:15.360Z] 3.4: Pulling from library/alpine
[2020-12-23T01:58:15.618Z] c1e54eec4b57: Pulling fs layer
[2020-12-23T01:58:15.875Z] c1e54eec4b57: Verifying Checksum
[2020-12-23T01:58:15.875Z] c1e54eec4b57: Download complete
[2020-12-23T01:58:15.875Z] c1e54eec4b57: Pull complete
[2020-12-23T01:58:15.875Z] Digest: sha256:b733d4a32c4da6a00a84df2ca32791bb03df95400243648d8c539e7b4cce329c
[2020-12-23T01:58:15.875Z] Status: Downloaded newer image for alpine:3.4
[2020-12-23T01:58:21.229Z] Stage "Build&Test" skipped due to earlier failure(s)
[2020-12-23T01:58:21.291Z] Stage "Packaging" skipped due to earlier failure(s)
[2020-12-23T01:58:21.370Z] Running in /var/lib/jenkins/workspace/Beats_beats_PR-23256/src/github.com/elastic/beats
[2020-12-23T01:58:21.592Z] Running on Jenkins in /var/lib/jenkins/workspace/Beats_beats_PR-23256
[2020-12-23T01:58:21.704Z] [INFO] getVaultSecret: Getting secrets
[2020-12-23T01:58:21.757Z] Masking supported pattern matches of $VAULT_ADDR or $VAULT_ROLE_ID or $VAULT_SECRET_ID
[2020-12-23T01:58:22.507Z] + chmod 755 generate-build-data.sh
[2020-12-23T01:58:22.507Z] + ./generate-build-data.sh https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/beats/PR-23256/ https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/beats/PR-23256/runs/1 FAILURE 1126462
[2020-12-23T01:58:22.757Z] INFO: curl https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/beats/PR-23256/runs/1/steps/?limit=10000 -o steps-info.json
[2020-12-23T01:58:23.668Z] INFO: curl https://beats-ci.elastic.co/blue/rest/organizations/jenkins/pipelines/Beats/beats/PR-23256/runs/1/tests/?status=FAILED -o tests-errors.json
[2020-12-23T01:58:23.668Z] Retry 1/3 exited 22, retrying in 1 seconds...
[2020-12-23T01:58:24.579Z] Retry 2/3 exited 22, retrying in 2 seconds...

❕ Flaky test report

No test was executed to be analysed.

[bmorelli25]

Neat.