Add 2 more video resources for data structures

README.md

@@ -265,6 +265,10 @@ Sometimes the classes are not in session so you have to wait a couple of months,
         - Learn how to make yourself ready for software engineer interviews from a former Google interviewer.
     - [ ] [Python for Data Structures, Algorithms, and Interviews! (paid course)](https://www.udemy.com/python-for-data-structures-algorithms-and-interviews/):
         - A Python centric interview prep course which covers data structures, algorithms, mock interviews and much more.
+    - [ ] [Intro to Data Structures and Algorithms using Python! (Udacity free course)](https://www.udacity.com/course/data-structures-and-algorithms-in-python--ud513):
+        - A free Python centric data structures and algorithms course.
+    - [ ] [Data Structures and Algorithms Nanodegree! (Udacity paid Nanodegree)](https://www.udacity.com/course/data-structures-and-algorithms-nanodegree--nd256):
+        - Get hands-on practice with over 100 data structures and algorithm exercises and guidance from a dedicated mentor to help prepare you for interviews and on-the-job scenarios.
 
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