App Configuration: add java readme (#7659)

specification/appconfiguration/resource-manager/readme.java.md

@@ -16,9 +16,23 @@ output-folder: $(azure-libraries-for-java-folder)/azure-mgmt-appconfiguration
 
 ``` yaml $(java) && $(multiapi)
 batch:
+  - tag: package-2019-10-01
   - tag: package-2019-02-01-preview
 ```
 
+### Tag: package-2019-10-01 and java
+
+These settings apply only when `--tag=package-2019-10-01 --java` is specified on the command line.
+Please also specify `--azure-libraries-for-java-folder=<path to the root directory of your azure-sdk-for-java clone>`.
+
+``` yaml $(tag)=='package-2019-10-01' && $(java) && $(multiapi)
+java:
+  namespace: com.microsoft.azure.management.appconfiguration.v2019_10_01
+  output-folder: $(azure-libraries-for-java-folder)/appconfiguration/resource-manager/v2019_10_01
+regenerate-manager: true
+generate-interface: true
+```
+
 ### Tag: package-2019-02-01-preview and java
 
 These settings apply only when `--tag=package-2019-02-01-preview --java` is specified on the command line.