[IMP] base: add a commit message template with the guidelines

commit_template.txt

@@ -0,0 +1,19 @@
+[TAG] application/module: describe your changes in a short sentence
+
+# If you feel that it might help a future reader to understand your commit
+# motivations, take some time to explain WHY you made these changes in a few
+# sentences. The WHAT is usually easily understood by reading the diff.
+#
+# Short description tip: structure your commit message as if it was completing
+# this sentence: "If merged, this commit will ...". For instance, the following
+# commit message is correct: "[IMP] sales: compress images to save space".
+#
+# Tag meanings:
+#
+# [ADD] = New content
+# [IMP] = Improvement
+# [FIX] = Content or RST fix
+# [REM] = Removal
+# [REF] = Refactoring (restructuring)
+# [MOV] = Move/rename
+#