Add link to writing good messages article

Co-Authored-By: joshuaboniface <joshua@boniface.me>

.github/pull_request_template.md

@@ -1,4 +1,5 @@
 Ensure your title is short, descriptive, and in the imperative mood (Fix X, Change Y, instead of Fixed X, Changed Y).
+For a good inspiration of what to write in commit messages and PR have a look at https://chris.beams.io/posts/git-commit/
 
 **Changes**
 Describe your changes here in 1-5 sentences.