#629: Enhance commit documentation (#630)

documentation/IDEasy-contribution-rules-and-guidelines.adoc

@@ -51,6 +51,28 @@ The following conventions are added on top by the IDEasy team from the learnings
 * Commit messages should always start with the issue number and a hashtag, so to automatically link the corresponding issue.
 * The title of a commit should be kept short and informative.
 * The description of a commit message can be used to elaborate on the title.
+* Always commit your changes in small logical units associated with an issue (see above section) using the commit message format:
+
+[source]
+#«issue-id»: «describe your change»
+
+* Then GitHub will automatically link the commit with the issue.
+* Example:
+
+[source]
+#1: added REST service for tablemanagement
+Implemented REST TableManagement class
+Added unit tests for TableManagement class
+
+* In case you worked on an issue from a different repository (e.g. change in `ide-settings` due to an issue in `IDEasy`), we use this commit message format:
+
+[source]
+«organization»/«repository»#«issue-id»: «describe your change»
+
+* Example:
+
+[source]
+devonfw/IDEasy/#5: added REST service for tablemanagement
 
 == Issue