docs: added CONTRIBUTING.md and a pull request template (#32)

* docs: add CONTRIBUTING.md

* docs: add pull request template

.github/pull_request_template.md

@@ -0,0 +1,5 @@
+---
+- [ ] I have reviewed CONTRIBUTING.md.
+- [ ] My commits and title use the [Conventional Commit](https://www.conventionalcommits.org/en/v1.0.0/) format.
+- [ ] I have documented any breaking changes according to [SemVer](https://semver.org/).
+---

CONTRIBUTING.md

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+# Contributing
+
+## Pull Request Process
+
+1. Ensure that any new install or build dependencies are documented in the README.md and PR request.
+2. Update the README.md with details of changes to the shell, this includes useful file locations
+   and breaking changes.
+3. The versioning scheme we use is [SemVer](http://semver.org/) and the commit scheme we use is 
+   [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/). Please document any 
+   backwards incompatible changes and be sure to name your commits correctly.