Updated README
Updated README

Scanned through it and corrected some spelling mistakes, nothing that affects the core purpose of the document.
MichMich/MagicMirror,heyheyhexi/MagicMirror,heyheyhexi/MagicMirror,MichMich/MagicMirror,MichMich/MagicMirror,Tyvonne/MagicMirror,Tyvonne/MagicMirror,heyheyhexi/MagicMirror,roramirez/MagicMirror,roramirez/MagicMirror,n8many/MagicMirror,Tyvonne/MagicMirror,n8many/MagicMirror,n8many/MagicMirror,Tyvonne/MagicMirror,roramirez/MagicMirror,MichMich/MagicMirror,n8many/MagicMirror,roramirez/MagicMirror,heyheyhexi/MagicMirror,n8many/MagicMirror