Add Stargazers plugin (#37)

.github/pull_request_template.md

@@ -6,7 +6,30 @@
 -->
 
 **Pull request description**
-<!-- A clear and concise description of what your pull request implements or fixs. -->
+<!--
+  A clear and concise description of what your pull request implements or fixs.
+
+  Please check the following:
+
+    > Documentation update
+      - Check spelling
+      - Respect current formatting
+
+    > New plugin
+      - Created new plugin in /source/plugins/ with index.mjs as entry point
+      - Added tests in /tests/metrics.test.js
+        - Added mocked data if needed (required for all APIs which requires a token or limited in requests)
+      - Updated action.yml with new plugin options
+        - Updated /source/app/action/index.mjs to retrieve plugin options with correct typing
+        - Updated /source/web/statics/* to support new plugin options
+        - Updated /settings.example.json with new plugin name
+      - Updated README.md to explain plugin features
+
+    > Code editions
+      - Ensure retro-compatibility with previous versions
+        - Unless feature is not released yet
+      - Respect current formatting
+-->
 
 **Additional context and screenshots**
 <!-- Add any other context or screenshots about your pull request here. -->