Enhancements to contributors page

[monsij]

This issue extends issue #3 and PR #21 . Requirement to create a more informative contributors page.

[monsij]

Assigned @harry-hov

[monsij]

GitMate.io thinks a possibly related issue is #3 (Add Contributors page).

[harry-hov]

working on it

[harry-hov]

Done working on this. Please take a look @monsij

[monsij]

Using access tokens, the quantity of commits and reviews is to made visible.