Add README for pset0

Author: tomasgoiba

pset0-search/README.md

@@ -0,0 +1,13 @@
+### Search
+
+Graph search algorithms (depth-first search, breadth-first search, and A*) and adversarial search algorithms (minimax).
+
+- [**Degrees**](degrees): Determine how many degrees of separation apart two actors are.  
+<p align="center">
+<code>python degrees.py large</code>
+</p>
+
+- [**Tic-tac-toe**](tictactoe): Play tic-tac-toe against an AI. 
+<p align="center">
+<code>python runner.py</code>
+</p>