Add 02 README

02_data_structures/README.md

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+# Lecture 2: Data structures and libraries
+
+Reviews the most basic data types and data structures. Covers how to represent big integers, sets and graphs, and how to augment binary search trees.
+
+<h2>Problems</h2>
+Solve some of the following problems on Kattis. You need <b>3</b> points to get full score.
+<ul>
+<li><a href="https://open.kattis.com/problems/deduplicatingfiles">Deduplicating files</a> (1 point)</li>
+<li><a href="https://open.kattis.com/problems/restaurant">Working at the Restaurant</a> (1 point)</li>
+<li><a href="https://open.kattis.com/problems/addingwords">Adding words</a> (1 point)</li>
+<li><a href="https://open.kattis.com/problems/dream">All Just A Dream</a> (1 point)</li>
+<li><a href="https://open.kattis.com/problems/moviecollection">Movie collection</a> (1 point)</li>
+</ul>
+<h2>Bonus problems</h2>
+If you want a challenge, you can try solving the following bonus problems.
+<ul>
+<li><a href="https://open.kattis.com/problems/trendingtopic">Trending Topic</a></li>
+<li><a href="https://open.kattis.com/problems/stogovi">Stogovi</a></li>
+</ul>