added decoder for keypad mapping #13
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added a mapping to decode digits to keypad alphabets.
keypad = {
"2": "ABC",
"3": "DEF",
"4": "GHI",
"5": "JKL",
"6": "MNO",
"7": "PQRS",
"8": "TUV",
"9": "WXYZ"
}