SSDM-13365: Added a simple git message hook script to be used by development team.

docs/hooks/commit-msg

+#!/bin/sh
+#
+# A simple hook script to check the commit log message.
+# Called by "git commit" with one argument, the name of the file
+# that has the commit message.  The hook should exit with non-zero
+# status after issuing an appropriate message if it wants to stop the
+# commit.
+#
+# To enable this hook, move it to .git/hooks directory and make it executable.
+# Remember to keep the name of the file as "commit-msg".
+
+commit_regex='(SSDM-[0-9]+:|merge|rebase)'
+error_msg="Aborting commit. Your commit message is missing an issue number ('SSDM-XXXX:')"
+
+if ! grep -iqE "$commit_regex" "$1"; then
+    echo "$error_msg" >&2
+    exit 1
+fi