Create challenge_2.md

Author: shivaylamba

Challenges/challenge_2.md

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+## Welcome to Challenge 2
+
+Welcome to the second challenge! 
+Today we will focus on how to fork and create a clone of a Github repository
+
+Task: 
+1. Create a fork of this repository 
+2. Clone the forked project locally in your system using the ``git clone`` command 
+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: 
+- URL of your forked repository 
+- A screenshot of the cloned project in your system