create PR template

.github/PULL_REQUEST_TEMPLATE.md

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+# Pull Request
+
+## Description
+
+Please include a summary of the change and which issue is fixed. Also, include relevant motivation and context. List any dependencies that are required for this change.
+
+Fixes # (issue)
+
+### How Has This Been Tested?
+
+Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.
+
+## Checklist:
+
+Before deployment
+
+- [ ]  100% test and branch coverage
+- [ ]  fuzz and invariant tests when applicable
+- [ ]  deployment or update scripts ready
+- [ ]  version management agreed upon and implemented
+- [ ]  documentation of work in Jira or Notion
+- [ ]  internal team review
+- [ ]  **Security Team review**
+
+
+After deployment
+
+- [ ]  Update [static](https://github.com/maticnetwork/static/tree/master/network) with new contract address and/or version
+- [ ]  create release if necessary
+
+### Additional context
+
+Add any other context about the pull request here.