Adding contributing steps in readme file

[saikuladeepgithub]

It is very important to add contributing steps to the readme file. I want to do this task. Could you please assign me this sir.

[Tejasri-Pendota]

since I'm a begginer too, I know how important it is to know how to contribute in an OS, I can very much relate to the new users , I would like to work on this issue ,Please assign this issue to me @TAHIR0110 under the label "gssoc"