Add git commit message template to the repository

Why:
* This helps to have a common commit message structure,
* This also helps to identify problems while writing the answers to these questions.

Changes to be committed:
	new file:   .gitmessage

.gitmessage

@@ -0,0 +1,24 @@
+Title of the commit message
+
+##################################
+Why:
+## Why is the change necessary?
+## What does the reviewer of my put request expect in the commit, help them to easily identify and point out unrelated changes!
+
+* ...
+
+##################################
+This change addresses the need by:
+## How does it address the issue? Like performance improvements, or bugs, or ... <if change is obvious omit this part>
+
+* ...
+
+##################################
+What side effects does this change have?
+## To many points here means a to large commit! (1 or 2 is fine)
+
+* ...
+
+# 50-character subject line
+#
+# 72-character wrapped longer description.