Root Readme file and gitignore file updated

Author: Shaon

.gitignore

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+*
+!*.md
+!/*.md
+!/*.c
+!*.png
+!/*.png

README.md

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-#Intro
+#Introduction
 
+**You need to have basic understanding of the C programming language to proceed with the codes from this repository.**
 
-### Primitive types or data structures in C
-Integer, Float, Boolean, Char 
+###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.
+- float - floating point value: i.e. a number with a fractional part.
+- double - a double-precision floating point value.
+- char - a single character.
+- void - valueless special purpose type.
+
+Other than these there are some derived data types. they are -
+- Arrays
+- Pointers
+- Structures
+- Enumeration
+
+#####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)
+
+###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
+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`
+
+you will get an executable named: `file-name`
+
+run it using:
+
+`./file_name`