Documentation: add PR template (#5851)

.github/pull_request_template.md

@@ -0,0 +1,30 @@
+<!-- 
+Title format should be:
+[Affected Packages] PR Type: title
+
+Example:
+[lexical-playground][lexical-link] Feature: Add more emojis 
+
+Choose from the following PR Types:
+Breaking change / Refactor / Feature / Bug Fix / Documentation Update / Chore
+-->
+
+## Description
+<!-- 
+- What is the current behavior that you are modifying? 
+- What are the behavior or changes that are being added by this PR?
+-->
+*Describe the changes in this pull request*
+
+**Closes:** #<!-- issue number -->
+
+## Test plan
+
+### Before
+
+*Insert relevant screenshots/recordings/automated-tests*
+
+
+### After
+
+*Insert relevant screenshots/recordings/automated-tests*