[DOC] Add primary dependencies to README.
[DOC] Add primary dependencies to README.

whotooktwarden/gatewayd,crazyquark/gatewayd,whotooktwarden/gatewayd,zealord/gatewayd,crazyquark/gatewayd,Parkjeahwan/awegeeks,zealord/gatewayd,xdv/gatewayd,xdv/gatewayd,Parkjeahwan/awegeeks