Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to JavaScript Obfuscator
+
+## Setup
+
+1 Clone your fork of the repository
+```
+$ git clone https://github.com/YOUR_USERNAME/javascript-obfuscator.git
+```
+
+2 Install npm dependencies
+```
+$ yarn
+```
+
+3 Run Dev process
+```
+$ yarn run watch
+```
+
+4 Run Build process
+```
+$ yarn run build
+```
+
+## Guidelines
+
+- Please try to [combine multiple commits before pushing](http://stackoverflow.com/questions/6934752/combining-multiple-commits-before-pushing-in-git)
+
+- Please use `TDD` when fixing bugs. This means that you should write a unit test that fails because it reproduces the issue, 
+then fix the issue and finally run the test to ensure that the issue has been resolved. This helps us prevent fixed bugs from 
+happening again in the future
+
+- Please keep the test coverage at 95+%. Write additional unit tests if necessary
+
+- Please keep code style consistent
+
+- Please create an issue before sending a PR if it is going to change the public interface of JavaScript Obfuscator or includes significant architecture changes
+