Update README.md

README.md

@@ -148,14 +148,47 @@ npm test
 ```
 
 Documentation
---------------
+==============
 
 * [github wiki pages](https://github.com/weseek/crowi-plus/wiki)
   * [Questions and Answers](https://github.com/weseek/crowi-plus/wiki/Questions-and-Answers)
 
 
-License
+Contributing
+============
+
+Found a Bug?
+-------------
+
+If you find a bug in the source code, you can help us by
+[submitting an issue](https://github.com/weseek/crowi-plus/issues) to our [GitHub Repository][github]. Even better, you can
+[submit a Pull Request](https://github.com/weseek/crowi-plus/pulls) with a fix.
+
+Missing a Feature?
+-------------------
+
+You can *request* a new feature by [submitting an issue](https://github.com/weseek/crowi-plus/issues) to our GitHub
+Repository. If you would like to *implement* a new feature, please submit an issue with
+a proposal for your work first, to be sure that we can use it.
+Please consider what kind of change it is:
+
+* For a **Major Feature**, first open an issue and outline your proposal so that it can be
+discussed. This will also allow us to better coordinate our efforts, prevent duplication of work,
+and help you to craft the change so that it is successfully accepted into the project.
+* **Small Features** can be crafted and directly [submitted as a Pull Request](https://github.com/weseek/crowi-plus/pulls).
+
+Language
 ---------
 
+Write issues and PRs in Engulish or Japanese.
+
+Discussion
+-----------
+
+If you have something to ask or want to discuss, please [join to our Slack team](https://crowi-plus-slackin.weseek.co.jp/). Talk about anything and anytime.
+
+License
+=======
+
 * The MIT License (MIT)
 * See LICENSE file.