Update README.md.

[Sid672]

Steps:

• Remove days line from the Readme.md .
  Example:

Day1 ------------------------------
Day2 ------------------------------
Day3 ------------------------------

• Contribution guidelines link
• Add issue link of issue: Solve and add new programs to different folder according to the sites. (Problem solving) #9
• Some basic steps and command lines of how to fork, create a pull request, avoid conflicts using git.
• Add details about folders:
  Example:

Format:
Folder name: Information / Type of programs this folder contains.

Like: 
Programs: It contains basic programs of java.