create PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+Thank you for contributing! Please follow the steps below to help us process your PR quickly.
+- 📝 Use a meaningful title for the pull request, e.g: "PAS-XXX | short pr description"
+- 💭 Write a clear description and share screenshots (if applicable) to help describe your change.
+- 🔍 Not all sections below will apply to you and are mostly for our internal team. It's okay to delete them if they are not applicable. 
+-->
+
+### Ticket
+<!-- For Jira Tasks: (remove if external contributor)  -->
+- Closes [PAS-XXX](https://bitwarden.atlassian.net/browse/PAS-XXX)
+
+<!-- For GitHub Issues: -->
+<!-- - Closes #XXX -->
+
+
+### Description
+<!--
+    Introduction that should allow the reviewer to quickly be able to understand the reason for opening this PR.
+-->
+
+### Shape
+<!--
+    Give a high-level overview of the technical design involved in the implemented changes.
+    If the changes don't have any architectural impact, you can remove this section.
+-->
+
+### Screenshots
+<!--
+    Include any relevant UI screenshots showcasing the before & after of your changes.
+    If the changes don't have any UI impact, you can remove this section.
+-->
+
+### Checklist
+I did the following to ensure that my changes were tested thoroughly:
+- __
+
+I did the following to ensure that my changes do not introduce security vulnerabilities:
+- __