update readme, add prepare for sever env

huangmingming

2023-01-30 30c509a64cb7837c8017746df4646d27800189f6

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beam_size: 10
penalty: 0.0
maxlenratio: 0.0
minlenratio: 0.0
ctc_weight: 0.5
lm_weight: 0.7