Add contributing.md file

CONTRIBUTING.md

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+# Contributing
+
+Contributions are welcome and will be fully credited.
+
+Contributions are accepted via Pull Requests on [Github](https://github.com/kanekescom/laravel-helperia).
+
+# Things you could do
+If you want to contribute but do not know where to start, this list provides some starting points.
+- Add license text
+- Remove rewriteRules.php
+- Set up TravisCI, StyleCI, ScrutinizerCI
+- Write a comprehensive ReadMe
+
+## Pull Requests
+
+- **Add tests!** - Your patch won't be accepted if it doesn't have tests.
+
+- **Document any change in behaviour** - Make sure the `readme.md` and any other relevant documentation are kept up-to-date.
+
+- **Consider our release cycle** - We try to follow [SemVer v2.0.0](http://semver.org/). Randomly breaking public APIs is not an option.
+
+- **One pull request per feature** - If you want to do more than one thing, send multiple pull requests.
+
+- **Send coherent history** - Make sure each individual commit in your pull request is meaningful. If you had to make multiple intermediate commits while developing, please [squash them](http://www.git-scm.com/book/en/v2/Git-Tools-Rewriting-History#Changing-Multiple-Commit-Messages) before submitting.
+
+
+**Happy coding**!