added json dump

char_vocab.json

@@ -0,0 +1 @@
+{"'": 0, "(": 1, ")": 2, "-": 3, ".": 4, "2": 5, "3": 6, "4": 7, "a": 8, "b": 9, "c": 10, "d": 11, "e": 12, "f": 13, "g": 14, "h": 15, "i": 16, "j": 17, "k": 18, "l": 19, "m": 20, "n": 21, "o": 22, "p": 23, "q": 24, "r": 25, "s": 26, "t": 27, "u": 28, "v": 29, "w": 30, "x": 31, "y": 32, "z": 33}