Adding Contribution guidelines

CONTRIBUTING.md

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+
+
+# Contributing to Codeuino
+
+🎉 First off, thanks for taking the time to contribute! This project would not be possible without people like you. 🎉
+
+## How Can I Contribute?
+
+
+#### Project requirements
+
+- [NodeJS](https://nodejs.org) (v8.10 or higher)
+- [npm](https://www.npmjs.com) (v4 or higher)
+- [yarn](https://yarnpkg.com) (v1 or higher)
+
+#### Local setup
+
+### Installing depencencies and running the app
+You should have `node` installed in your system.  
+* Fork the repository
+
+* Clone the repository 
+  `git clone https://github.com/<username>/website-www.codeuino.org.git`
+  where \< username \> is your username
+
+* Install create-react-app
+  `npm install -g create-react-app`
+
+* `cd website-www.codeuino.org`
+
+* `npm install`
+
+* `npm start`
+
+
+This will:
+1. Install all JavaScript dependencies.
+
+You can then access the website at [http://localhost:3000](http://localhost:3000).
+
+
+
+## Submitting an Issue
+
+Did you notice a bug? Do you have a feature request? Please file an issue [here on GitHub](https://github.com/codeuino/website-www.codeuino.org/issues).
+
+## Something Else?
+
+Want to talk about something but can't find a home for it here? Head to our [Slack Channel](http://slack.codeuino.org/) to discuss everything from feedback and ideas to questions and random musings.
+
+## How to update your local master branch
+* First of all add upstream remote. You can add upstream like
+```bash
+git remote add upstream https://github.com/codeuino/website-www.codeuino.org.git
+```
+* Now fetch the updated master branch
+```bash
+git fetch upstream
+```
+* Now merge fetch code to your local branch master
+```bash
+git merge upstream/master
+```