add a table of contents, close #61

Author: Karan Goel

README.md

@@ -23,8 +23,21 @@ Problems are motivated by the ones shared at:
 * [Martyr2’s Mega Project List](http://www.dreamincode.net/forums/topic/78802-martyr2s-mega-project-ideas-list/)
 * [Rosetta Code](http://rosettacode.org/)
 
-
-================================
+## Table of Contents
+
+- [Numbers](https://github.com/karan/Projects#numbers)
+- [Classic Algorithms](https://github.com/karan/Projects#classic-algorithms)
+- [Graph](https://github.com/karan/Projects#graph)
+- [Data Structures](https://github.com/karan/Projects#data-structures)
+- [Text](https://github.com/karan/Projects#text)
+- [Networking](https://github.com/karan/Projects#networking)
+- [Classes](https://github.com/karan/Projects#classes)
+- [Threading](https://github.com/karan/Projects#threading)
+- [Web](https://github.com/karan/Projects#web)
+- [Files](https://github.com/karan/Projects#files)
+- [Databases](https://github.com/karan/Projects#databases)
+- [Graphics and Multimedia](https://github.com/karan/Projects#graphics-and-multimedia)
+- [Security](https://github.com/karan/Projects#security)
 
 Numbers
 ---------