Provide docs for creating express-session store

[r-rajaneesh]

Please create a docs on what params must to given for the session store to work

[dougwilson]

Hi @Nigelrex we have the section https://github.com/expressjs/session#session-store-implementation dedicated to that. If you can be more specific to what is missing, please do and you can always open a pr with the needed change or I can add it. There is a aection already and the request is too vague to know what is missing from it.