.github: add multiple issues template

This move the current issue template to a bug-report template, and add
new ones (one for feature request and one free form). This follows
what was done in `tektoncd/cli`.

Signed-off-by: Vincent Demeester <vdemeest@redhat.com>

.github/issue-template.md → .github/ISSUE_TEMPLATE/bug-report.md

@@ -1,6 +1,7 @@
 ---
-name: Issue Template
-about: Template for both bug reports and feature requests
+name: Bug Report
+about: Template for bug reports
+labels: kind/bug
 ---
 
 # Expected Behavior

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,13 @@
+---
+name: Feature Request
+about: Template for feature requests
+labels: kind/feature
+---
+
+### Feature request
+
+<!-- Please describe the feature request and why you would like to have it -->
+
+### Use case
+
+<!-- Please add a concrete use case to demonstrate how such a feature would add value for the user. If you don't have a use case for your feature, please remove this section (however providing a good use case increases the likelihood to be picked up) -->

.github/ISSUE_TEMPLATE/free-form.md

@@ -0,0 +1,4 @@
+---
+name: Free Form
+about: Create an unstructured issue
+---