updated readme to include external dependencies under tech-stack section.
updated readme to include external dependencies under tech-stack section.

niraj-thakur/restfiddle,nileshbhosale/restfiddle,chiranjeevjain/restfiddle,kshiji/restfiddle,gnanam336/restfiddle,rka12/restfiddle,AnujaK/restfiddle,chiranjeevjain/restfiddle,onkardevale55/restfiddle1,nileshbhosale/restfiddle,onkardevale55/restfiddle1,AnujaK/restfiddle,aashish13/restfiddle,gnanam336/restfiddle,aashish13/restfiddle,rka12/restfiddle,niraj-thakur/restfiddle,kshiji/restfiddle