Testing Toolkit v1 PR Template (ethereum#536)

* dev: add: pull request template

.github/pull_request_template.md

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+# Description
+
+Please provide a detailed description of what was done in this PR
+
+# Changes
+
+- [ ] Bugfix (non-breaking change that solves an issue)
+- [ ] Hotfix (change that solves an urgent issue, and requires immediate attention)
+- [ ] New feature (non-breaking change that adds functionality)
+- [ ] Breaking change (change that is not backwards-compatible and/or changes current functionality)
+
+# Breaking changes
+
+Please complete this section if any breaking changes have been made, otherwise delete it
+
+# Checklist
+
+- [ ] I have added at least 2 reviewer or the whole pos-v1 team
+- [ ] I have added sufficient documentation in code
+- [ ] I will be resolving comments - if any - by pushing each fix in a separate commit and linking the commit hash in the comment reply
+
+# Cross repository changes
+
+- [ ] This PR requires changes to heimdall
+    - In case link the PR here:
+- [ ] This PR requires changes to matic-cli
+    - In case link the PR here:
+
+## Testing
+
+- [ ] I have added unit tests
+- [ ] I have added tests to CI
+- [ ] I have tested this code manually on local environment
+- [ ] I have tested this code manually on remote devnet using express-cli
+- [ ] I have tested this code manually on mumbai
+- [ ] I have created new e2e tests into express-cli
+
+### Manual tests
+
+Please complete this section with the steps you performed if you ran manual tests for this functionality, otherwise delete it
+
+# Additional comments
+
+Please post additional comments in this section if you have them, otherwise delete it