Readme modification: Addition of Installation & Contributions.

[m-bilal-ahmed]

I added the content table for the entire readme. This way it is easier to navigate. On top of that, I added an installation section and a contributions section. The former adds instructions on prerequisites needed to run the actual project on your local machine. I included the codded needed to run on the CLI. Then I added a contributions section that specified how to add changes to the project or report any bugs for first-time users. I also highlighted potential styling options for someone contributing for the first time.