Create CONTRIBUTING.md

Author: ashokdey

CONTRIBUTING.md

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+# Contribution Guide 
+
+Thanks for taking interest and I appreciate your efforts towards making this projects even better. 
+
+## How to setup?
+
+This is the most simple project when it comes to contributions, setup, opening issues/pull requests. So et's get started.
+
+- Clone the repo using the command `git clone git@github.com:knaxus/problem-solving-javascript.git`<sup>1</sup>
+- Install the packages to get suport for linter using `npm install`
+
+1: If you do not have **ssh** setup for github, while cloning go with **https** 
+
+### Before you start, keep the following things in mind:
+- We use ESLint for code linting
+- The linter follows [Airbnb JavaScript Style Guide](https://github.com/airbnb/javascript)
+- Go though the folder structure carefully and follow the same
+- Go though the format and file convenetions used while adding tests (both test case and test files)
+
+## Adding your code
+
+- When adding a new problem with solution
+  - Take care of the filename convention (Very Important)
+  - Problem statement should be there and support it with some examples
+  - Make sure you've add the **Run Time Complexity** of your solution
+  - Please take care of the segregation of the Problems as per the given Folder Structure
+  - It's great if you can add the Unit Tests to verify your solutions as well
+
+- When adding a Unit Test
+  - Take care of the file name convention
+  - Make sure CI (Travis) is passing
+
+### Notes
+
+- Keep an eye on this guide, it's subjected to change frequently.
+- Please do not break the ESLint rules
+- Todo
+  - Issue Template
+  - PR Template