Adding pull request template for discord role

Author: elvis kahoro

.github/workflows/PULL_REQUEST_TEMPLATE.md

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+# Pull Request Template
+
+## Discord username (optional)
+
+If you're in our Discord server please include your formatted like so: elvis#4747.
+
+This is so we can give you the Contributor Discord role.
+Note: It must be labelled like so: username#4747 (make sure to include the #XXXX).
+
+## Description of changes (updated or new workflows)
+
+Descrption: