README file modified

Author: me-shaon

README.md

@@ -1,8 +1,8 @@
-#Introduction
+# Introduction
 
 **You need to have basic understanding of the C programming language to proceed with the codes from this repository.**
 
-###Primitive types and built-in data structures in C
+### Primitive types and built-in data structures in C
 C is a statically typed language. Each of the variables should be type casted.
 There are five basic data types associated with variables:
 - int - integer: a whole number.
@@ -17,22 +17,22 @@ Other than these there are some derived data types. they are -
 - Structures
 - Enumeration
 
-#####More details about data types in C:
+##### More details about data types in C:
 - [C data types - Tutorialspoint](https://www.tutorialspoint.com/cprogramming/c_data_types.htm)
 - [C programming data types - programiz](http://www.programiz.com/c-programming/c-data-types)
 
-###Big-O Cheat Sheet
+### Big-O Cheat Sheet
 
 
 [Big-O Cheat Sheet Link](http://bigocheatsheet.com/)
 
-###How to Use
+### How to Use
 To test or use codes from this repository you can use any popular IDE, online Editor or compile them locally using GCC compiler.
 Following links will help on how to compile a C code in linux.
 - http://www.akira.ruc.dk/~keld/teaching/CAN_e14/Readings/How%20to%20Compile%20and%20Run%20a%20C%20Program%20on%20Ubuntu%20Linux.pdf
 - http://www.cyberciti.biz/faq/howto-compile-and-run-c-cplusplus-code-in-linux/
 
-######TL;DR
+###### TL;DR
 Run following command to compile a C code (You need to have [gcc compiler](https://help.ubuntu.com/community/InstallingCompilers) installed):
 
 `gcc file_name.c -o file_name`
@@ -42,3 +42,6 @@ you will get an executable named: `file-name`
 run it using:
 
 `./file_name`
+
+### Useful Links:
+* [Algorithms, 4th Edition (book by: Robert Sedgewick and Kevin Wayne)](http://algs4.cs.princeton.edu/home/)