PR template

pull_request_template.md

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+## PR description
+
+## General checklist
+
+- [ ] You have reviewed the guidelines [document](https://docs.google.com/document/d/1wqcOafLx5hth8SAg4dqV_LV3un3m5WYR8RdTJ4MbbUM/edit?usp=sharing).
+- [ ] PR name contains fix version. For example, "[3.3.4] Hotfix of some UI component" or "[3.4] New Super Feature".
+- [ ] Description references specific [issue](https://github.com/thingsboard/thingsboard/issues).
+- [ ] Description contains human-readable scope of changes.
+- [ ] Description contains brief notes about what needs to be added to the documentation.
+- [ ] No merge conficts.
+- [ ] Changes are backward compatible or upgrade script is provided.
+- [ ] Similar PR is opened for PE version to simplify merge. Required for internal contributors only.
+  
+## UI Feature checklist
+
+- [ ] Screenshots with affected component(s) are added. The best option is to provide 2 screens: before and after changes;
+- [ ] If you change widget or other API, ensure it is backward-compatible or upgrade script is present.
+- [ ] Ensure new API is documented [here](https://github.com/thingsboard/thingsboard-ui-help)
+
+## Back-end Feature checklist
+
+- [ ] Added corresponding unit and/or integration test(s). Provide written explanation in the PR description if you have failed to add tests.
+- [ ] If new dependency was added: the dependency tree is checked for conflicts.
+- [ ] If new service was added: the service is marked with corresponding @TbCoreComponent, @TbRuleEngineComponent, @TbTransportComponent, etc.
+- [ ] If new REST API was added: the RestClient.java was updated, issue for [Python REST client](https://github.com/thingsboard/thingsboard-python-rest-client) is created.
+
+
+