Create CONTRIBUTING.md

Author: NishkarshRaj

CONTRIBUTING.md

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+# How to Collaborate:
+
+1. Fork the repository to your own GitHub account.
+
+2. Clone the repository to your local machine
+```
+$ git clone "https://www.github.com/{Username}/Automation-using-Shell-Scripts"
+```
+where username is your GitHub account username.
+
+3. Create a branch where you can do your local work.
+Never work on **master** branch as we do not allow master commits except by admins.
+```
+$ git branch {branchname}
+$ git checkout branchname
+```
+
+4. Do your work and stage your changes.
+```
+$ git add <filename>
+```
+
+5. Commit you changes with a commit message containing your name, file(s) worked upon, changes added.
+```
+$ git commit -m "Name| files| Changes"
+```
+
+6. Push changes to your forked repository
+```
+$ git push -u origin branchname
+```
+7. Create a pull request to the upstream repository.
+
+# Synchronize forked repository with Upstream repository
+
+1. Create upstream as our repository
+```
+$ git remote add upstream "https://www.github.com/NishkarshRaj/Automation-using-Shell-Scripts"
+```
+
+2. Fetch upstream changes in local machine
+```
+$ git fetch upstream
+```
+
+3. Switch to master branch
+```
+$ git checkout master
+```
+
+4. Merge changes in local machine
+```
+$ git merge upstream/master
+```
+
+5. Push changes to your forked GitHub repository
+```
+$ git push -f origin master
+```