Added grammar for Solidity programming language
Added grammar for Solidity programming language

github/linguist,sebgod/linguist,pchaigno/linguist,MahmoudFayed/linguist,sebgod/linguist,stanhu/linguist,erkyrath/linguist,pchaigno/linguist,mwpastore/linguist,christop/linguist,christop/linguist,erkyrath/linguist,sebgod/linguist,mwpastore/linguist,github/linguist,stanhu/linguist,tschf/linguist,github/linguist,JJ/linguist,github/linguist,yyx990803/linguist,tschf/linguist,JJ/linguist,yyx990803/linguist,stanhu/linguist,sebgod/linguist,pchaigno/linguist,JJ/linguist,R4PaSs/linguist,erkyrath/linguist,yyx990803/linguist,pchaigno/linguist,stanhu/linguist,JJ/linguist,MahmoudFayed/linguist,erkyrath/linguist,yyx990803/linguist,R4PaSs/linguist