docs: add the 'release process' in README (#7)

Also configure the GitHub auto-generated release notes.

Author: tbouffard

.github/release.yml

@@ -0,0 +1,18 @@
+changelog:
+  exclude:
+    labels:
+      - chore
+      - dependencies
+  categories:
+    - title: 🎉 New Features
+      labels:
+        - enhancement
+    - title: 🐛 Bug Fixes
+      labels:
+        - bug
+    - title: 📝 Documentation
+      labels:
+        - documentation
+    - title: Other Changes
+      labels:
+        - "*"

README.md

@@ -6,3 +6,15 @@ Internal tools for bpmn-visualization
 - [bpmn-rendering-miwg-test-suite](bpmn-rendering-miwg-test-suite/README.md): Generate screenshots of BPMN 
 Diagram rendering of all reference files from the miwg-test-suite project. It helps to publish the results for a given
 bpmn-visualization version.
+
+
+## Release process
+
+Go to [GitHub release](https://github.com/process-analytics/bpmn-visualization-tools/releases)
+
+Then
+- create a new draft release
+- for tag, use **v**x.y.z (do not forget the 'v' prefix)
+- for name, same value as tag without the 'v'
+- use the auto-generated release notes (do some cleanup if necessary)
+- publish to create the git tag and make the release publicly available