feat: adds pull request template

.github/pull_request_template.md

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+<!--
+When creating a pull request, you should uncomment the section below that
+describes the type of pull request you are submitting.
+-->
+
+<!-- START SECTION: all pull requests
+
+_Describe the problem or feature in addition to a link to the issues._
+
+Before submitting this PR, please make sure:
+
+- [ ] You have added a few sentences describing the PR here.
+- [ ] You have added yourself or the appropriate individual as the assignee.
+- [ ] You have added at least one relevant code reviewer to the PR.
+- [ ] Your code builds clean without any errors or warnings.
+- [ ] You have added tests (when appropriate).
+- [ ] You have updated the README or other documentation to account for these
+ changes (when appropriate).
+- [ ] You have added an entry to the relevant `CHANGELOG.md` (see
+ ["keep a changelog"] for more information).
+- [ ] Your commit messages follow the [conventional commit] style.
+
+END SECTION -->
+
+[conventional commit]: https://www.conventionalcommits.org/en/v1.0.0/#summary
+["keep a changelog"]: https://keepachangelog.com/en/1.0.0/

crankshaft-config/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+### Added
+
+* Adds the initial version of the crate.

crankshaft-docker/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+### Added
+
+* Adds the initial version of the crate.

crankshaft-engine/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+### Added
+
+* Adds the initial version of the crate.

crankshaft/CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## Unreleased
+
+### Added
+
+* Adds the initial version of the crate.