Create PULL_REQUEST_TEMPLATE.md

Author: Jason2866

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,9 @@
+## Description:
+
+**Related issue (if applicable):** fixes #<issue number goes here>
+
+## Checklist:
+  - [ ] The pull request is done against the latest develop branch
+  - [ ] Only relevant files were touched
+  - [ ] Only one feature/fix was added per PR, more changes are allowed when changing boards.json
+  - [ ] I accept the [CLA](https://github.com/pioarduino/platform-espressif32/blob/develop/CONTRIBUTING.md).