Add CONTRIBUTING guide to explain contribution

Author: peter279k

CONTRIBUTING.md

@@ -0,0 +1,32 @@
+# Contributing
+
+Contributions are **welcome** and will be fully **credited**.
+
+We accept contributions via Pull Requests on [Github](https://github.com/spatie/laravel-backup).
+
+
+## Pull Requests
+
+- **[PSR-2 Coding Standard](https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-2-coding-style-guide.md)** - The easiest way to apply the conventions is to install [PHP Code Sniffer](http://pear.php.net/package/PHP_CodeSniffer).
+
+- **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
+$ vendor/bin/phpunit -v --colors --coverage-text
+```
+
+
+**Happy coding**!

README.md

@@ -196,9 +196,13 @@ $writer->move('my/new_name.csv');   //writer will write in "new_name.csv"
 
 # Hall of Fame - The list of contributors
 
-* [peter279k](https://github.com/peter279k) - [homepage](https://peterli.website) 
+* [peter279k](https://github.com/peter279k) - [homepage](https://peterli.website)
 * [stevleibelt](https://github.com/stevleibelt) - [homepage](https://stev.leibelt.de)
 
+# Contributing
+
+Please see [CONTRIBUTING](https://github.com/bazzline/php_component_csv/blob/master/CONTRIBUTING.md) for details.
+
 # Final Words
 
 Star it if you like it :-). Add issues if you need it. Pull patches if you enjoy it. Write a blog entry if you use it. [Donate something](https://gratipay.com/~stevleibelt) if you love it :-].