Create CONTRIBUTING.md

Author: NishkarshRaj

CONTRIBUTING.md

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+## How to contribute:
+
+1. Fork this repository on your own GitHub Account
+
+2. Clone this repository to your local machine
+
+```
+$ git clone "https://www.github.com/{Your Git Username}/Evolvve-Student-Chapter-Application"
+```
+
+3. Go to the root folder of this repository
+```
+cd Evolvve-Student-Chapter-Application
+```
+
+4. Make your changes on new branch
+```
+$ git checkout -b {branch name}
+```
+
+5. Stage your changes
+```
+$ git add {filename}
+```
+
+6. Commit your changes
+```
+$ git commit -m "Commit message"
+```
+
+7. Push your branch
+```
+$ git push -u origin {branch name}
+```
+
+8. Go to GitHub and open a pull request to the upstream repository
+
+## How to update forked repository with our main repository
+
+```
+$ git remote add upstream "https://www.github.com/NishkarshRaj/Evolvve-Student-Chapter-App"
+$ git checkout master
+$ git fetch upstream
+$ git merge upstream/master
+$ git push -f origin master
+```