Update Readme following moja global style guide

[aornugent]

One for the Documentation Working Group - here is some background: https://docs.google.com/document/d/1YxG9yhVhf8iONfk4ugzf-T8H73knfSFBYIoSnsHosco/ and @Tonnix can provide installation help.

[riyachouhan7]

Hey @HarshCasper can I get the access to work on it? I would like to work on it and contribute.