Added the first draft of CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Matterwiki
+
+Thank you for taking the time to contribute! :tada::+1:
+
+## Basic guidelines for contributing
+* Start off by [forking this repository](https://github.com/Matterwiki/Matterwiki#fork-destination-box).
+* Create a branch to start your work `git checkout -b your-feature-name`
+* Commit your work
+* Create a pull request
+
+## Local dev setup
+Once you've forked this repo and `clone`d your fork, you would have to run `npm install`.  The development server can then be started with `npm run dev`.
+
+## The code
+*  The `api/` directory contains code for the node backend
+*  The `client/` directory contains the React jsx files and basically all the frontend code powering this app
+*  The `models/` directory has the bookshelf models associated with the SQLite DB
+*  `node ./index.js` , starts the server, which serves the JS files, assets and of course, index.html.  
+*  For the production version, run `npm start build` and start `index.js` with a process manager like [PM2](http://pm2.keymetrics.io/). 
+
+## Features
+* The dev setup has webpack's Hot Module Replacement (HMR) enabled, which ([according to the docs](https://webpack.js.org/concepts/hot-module-replacement/)), 
+
+	> exchanges, adds, or removes modules while an application is running without a page reload. 
+
+   This helps improve speedup dev time significantly. 
+* We've got sourcemaps enabled, so that makes debugging really easy.