small update

Signed-off-by: Sreeja Saha <sreejasaha.ece2019@nsec.ac.in>

Author: shivaylamba

Challenges/challenge_15.md

@@ -4,6 +4,8 @@ Welcome to the 15th Challenge
 
 In this 2 part challenge, we will try to emulate and fix merge conflicts via git. 
 
+Today is the first part of this challenge: 
+
 Task: 
 1. Update your Forked Repo From the Original Repo. Also ensure that your branch ``your-user-name-details`` is also synced with the latest changes from the original repository