fix: added CONTRIBUTING file

CONTRIBUTING.md

@@ -0,0 +1,36 @@
+# Contributing
+
+Contributions are **welcome** and will be fully **credited**.
+
+We accept contributions via Pull Requests on [Github](https://github.com/killmi/Office365-API-Oauth2-Laravel ).
+
+
+## Pull Requests
+
+- **[PSR-12 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-12-extended-coding-style-guide.md)** - The easiest way to apply the conventions is running the command from makefile:
+
+``` bash
+make php.cs
+```
+
+- **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.
+
+- **Create feature branches** - Don't ask us to pull from your master branch.
+
+- **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.
+
+
+## Running Tests
+
+``` bash
+$ make test
+```
+
+
+**Happy coding**!

README.md

@@ -93,10 +93,18 @@ $user->save();
 
 The implementation of the query builder is inspired on Laravel Query Builder, to get more documentation follow the [link](https://laravel.com/docs/master/queries).
 
+## Roadmap
+
+You can get more details of the plans for this early version on the following [link](https://github.com/mgcostaParedes/spanner-orm-builder/projects/1).
+
+## Contributing
+
+Please see [CONTRIBUTING](CONTRIBUTING.md) for details.
+
+
 ## Credits
 
 - [Miguel Costa][https://github.com/mgcostaParedes]
-- [All Contributors][link-contributors]
 
 ## License