docs: setup PULL_REQUEST_TEMPLATE.md

Author: zobweyt

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,27 @@
+<!--
+Thanks in advance for your contribution to this project!
+
+Before opening a PR, please consider the reading the CONTRIBUTING.md in the root.
+-->
+
+### Description
+<!--
+A brief explanation of changes made in this PR.
+-->
+
+### Changes
+<!--
+List things changed in this PR.
+
+Example:
+* Fix X route
+* Update Y function
+-->
+
+### Associated Issues
+<!--
+List issues that are related to this PR.
+
+Example:
+* resolves #6969
+-->