Adding help for cloning repo.
Merge pull request #1 from lalit-aggarwal/lalit

Adding help for cloning repo.
Merge pull request #2 from Achal-Aggarwal/achal

Improving lexer.
Adding more helping commands.
Merge pull request #4 from Achal-Aggarwal/achal

Finishing Parser.
Merge branches 'achal' and 'master'
Merge branch 'master' of https://github.com/Achal-Aggarwal/Compreter
Three address code generation, except function calling and some other parts.