Update

Author: sreejasaha19

Challenges/challenge_13.md

@@ -0,0 +1,10 @@
+## Welcome to Challenge 13
+
+Welcome to the 13th Challenge 
+
+Today's challenge involves how to use ``git stash`` command effectively. You can refer on how to stash your commits [here](https://git-scm.com/book/en/v2/Git-Tools-Stashing-and-Cleaning)
+
+Task: 
+1. Inside the branch you created in the previous challenge ``your-username-details`` create a new file inside the ``contributors/<YOUR-GITHUB_USERNAME>/`` directory.
+2. Use the git stash command to move these changes to the stash area
+3. Delete the content from the stash area and share a screenshot of this inside the Github issue you created in the first challenge