update read me to explain a new branch created for this task so a pull request to can pushed

Author: HassanOHOsman

Sprint-2/implement_linked_list/README.md

@@ -11,3 +11,6 @@ It should support the following operations. Each operation should have a O(1) wo
 There are some tests in `linked_list_test.py` for your implementation - feel free to write more.
 
 * A branch was later created so that a PR can be pushed.
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+
+* Make a new branch for implementing linked list in python