add aishell-1 rnnt egs

aky15

2023-03-21 8a100b731efba8c18f7e7b6cb1cb04ded94248b3

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 1.0
lm_weight: 0.7