Update LICENSE.md

ibrahimhaddad · web-flow · commit 012066ecd2be · 2021-08-20T23:00:30.000+03:00
diff --git a/LICENSE.md b/LICENSE.md
@@ -1,3 +1,5 @@
 The content of this folder is licensed under the Attribution 4.0 International (CC BY 4.0).
 
+SPDX Short identifier CC-BY-4.0.
+
 Please visit the licence website for the full license text: https://creativecommons.org/licenses/by/4.0/
