Create challenge_3.md

Author: shivaylamba

Challenges/challenge_3.md

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+## Welcome to Challenge 3
+
+Welcome to the third challenge! 
+Today we will focus on how to create a new branch in a git repository
+
+Task: 
+1. Following up on the [previous task](https://github.com/scaleracademy/scaler-september-open-source-challenge/blob/main/Challenges/challenge_2.md), create a new branch locally in your forked clone repository
+2. The branch name should be as follows: ``your_github_username-details``. Example: ``shivaylamba-details``
+3. Add a new comment to the issue you created in the [first task](https://github.com/scaleracademy/scaler-september-open-source-challenge/blob/main/Challenges/challenge_1.md). The comment should have the following:
+- Screenshot showing the list of all the current branches inside of your forked clone repository