Quotes around sequence of chars
05AB1E, 13 bytes

0.ø.γ.u}'"ý¦¨


Try it online!

0.ø              # surround input string with 0s
   .γ  }         # group characters by:
     .u          #  is uppercase?
        '"ý      # join groups with quotes
           ¦¨    # remove the first and last characters (0s)