added base files

.gitattributes

+# Path-based git attributes
+# https://www.kernel.org/pub/software/scm/git/docs/gitattributes.html
+
+# Ignore all test and documentation with "export-ignore".
+/.gitattributes     export-ignore
+/.gitignore         export-ignore
+/.travis.yml        export-ignore
+/phpunit.xml.dist   export-ignore
+/.scrutinizer.yml   export-ignore
+/tests              export-ignore
+/composer.lock      export-ignore
\ No newline at end of file

.gitignore

-# phpstorm project files
+# ignore IDE specific files and dirs
 .idea
-
-# netbeans project files
-nbproject
-
-# zend studio for eclipse project files
-.buildpath
-.project
 .settings
+.project
+.buildpath
 
-# windows thumbnail cache
-Thumbs.db
-
-# composer vendor dir
-/vendor
-
-# composer itself is not needed
-composer.phar
-composer.lock
-
-# Mac DS_Store Files
-.DS_Store
-
-# phpunit itself is not needed
-phpunit.phar
-# local phpunit config
-/phpunit.xml
+# ignore temporary files
+*~
\ No newline at end of file

CONTRIBUTING.md

+# Contributing
+
+Contributions are **welcome** and will be fully **credited**.
+
+We accept contributions via Pull Requests on [Github](https://github.com/2amigos/yii2-tinymce-widget).
+
+
+## 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 before submitting.
+
+
+## Running Tests
+
+``` bash
+$ phpunit
+```
+
+
+**Happy coding**!
\ No newline at end of file