docs(PR): add PR template [skip ci]

Author: solkimicreb

.github/ISSUE_TEMPLATE/pull_request_template.md

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+Resolves #
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+Proposed changes:
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+Please follow the [angular commit message format](https://github.com/angular/angular/blob/master/CONTRIBUTING.md#-commit-message-guidelines). Example: `docs(readme): fix title typo`