Update readme

CONTRIBUTING.md

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+# Contributing
+
+First off, thanks for considering contributing to Khmerlang Keyboard!
+
+There are several ways to contribute to Khmerlang Keyboard. This document provides some general guidelines for each type of
+contribution.
+
+## Giving general feedback
+
+NEW! You can now give [general feedback](http://m.me/khmerlang.official)
+to our official Facebook page.
+
+## Adding a new feature or making large changes
+
+If you intend to add a new feature or to make large changes, please discuss this first through a proposal on GitHub.
+Discussing your idea enables both you and the dev team that we are on the same page before you start on working on your
+change. If you have any questions, feel free to ask for help at any time!
+
+## Adding a new keyboard layout
+
+Adding a layout to Khmerlang Keyboard is very easy. Most of the time is
+enough to look at the existing layout files, but the following attempts to help you in creating layouts from scratch.
+
+## Bug reporting
+
+This kind of contribution is the most important, as it tells where Khmerlang Keyboard has flaws and thus should be improved to
+maximize stability and user experience.
+
+## Donating
+
+If none of the above options are feasible for you but you still want to show your support, you can also buy me a coffee,
+so I can stay up all night and chase away bugs or add new cool stuff :)
+Contact to our official [Facebook page](http://m.me/khmerlang.official) for available options!

README.md

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+<img align="left" width="80" height="80"
+src="images/icon.png" alt="App icon">
+
 # Khmerlang Keyboard
 
 <img src="images/phone_8.jpg"
@@ -41,6 +44,10 @@ Feature it doesn't have and probably will never have:
       alt="Get it on Google Play"
       height="80">](https://play.google.com/store/apps/details?id=com.rathanak.khmerroman)
 
+## Resources
+
+- [Task management](https://trello.com/b/emfEoZt2)
+
 ## Licensed
 
 Licensed under MIT