Adds CLI information to the README.
Adds CLI information to the README.

ollie314/mermaid,dbrans/mermaid,wcy123/mermaid,BionicClick/mermaid,bollwyvl/mermaid,codeaudit/mermaid,mehulsbhatt/mermaid,BionicClick/mermaid,dbrans/mermaid,dbrans/mermaid,wewelove/mermaid,wewelove/mermaid,guiquanz/mermaid,gillesdemey/mermaid,9n/mermaid,mcanthony/mermaid,mehulsbhatt/mermaid,BionicClick/mermaid,wuguanghai45/mermaid,DataMcFly/mermaid,codeaudit/mermaid,pnkfelix/mermaid,tylingsoft/mermaid,pnkfelix/mermaid,codeaudit/mermaid,pnkfelix/mermaid,ollie314/mermaid,knsv/mermaid,wuguanghai45/mermaid,9n/mermaid,knsv/mermaid,DataMcFly/mermaid,wcy123/mermaid,mcanthony/mermaid,guiquanz/mermaid,Muoversi/mermaid,guiquanz/mermaid,9n/mermaid,wcy123/mermaid,wewelove/mermaid,ollie314/mermaid,tylingsoft/mermaid,gillesdemey/mermaid,wuguanghai45/mermaid,gillesdemey/mermaid,Muoversi/mermaid,tylingsoft/mermaid,DataMcFly/mermaid,bollwyvl/mermaid,mcanthony/mermaid,Muoversi/mermaid,bollwyvl/mermaid,mehulsbhatt/mermaid