rename asr egs

examples/aishell/README.md

 # ASR
 
-* s0 for deepspeech2
-* s1 for u2/transformer/conformer
+* asr0 - deepspeech2 Streaming/Non-Streaming
+* asr1 - transformer/conformer Streaming/Non-Streaming
+* asr2 - transformer/conformer Streaming/Non-Streaming with Kaldi feature
+
 
 ## Data
 

examples/librispeech/README.md

 # ASR
 
-* s0 is for deepspeech2 offline
-* s1 is for transformer/conformer/U2
-* s2 is for transformer/conformer/U2 w/ kaldi feat, need install Kaldi
+* asr0 - deepspeech2 Streaming/Non-Streaming
+* asr1 - transformer/conformer Streaming/Non-Streaming
+* asr2 - transformer/conformer Streaming/Non-Streaming with Kaldi feature
+
 
 ## Data
 | Data Subset | Duration in Seconds |

examples/ted_en_zh/README.md

 # TED En -> Zh
 
-* t0 for u2 speech translation
+* st0 - conformer/transformer speech translation

examples/timit/README.md

 # TIMIT
 
-* asr1 - u2 model with phone unit
+asr model with phone unit
+
+* asr0 - deepspeech2 Streaming/Non-Streaming
+* asr1 - transformer/conformer Streaming/Non-Streaming
+* asr2 - transformer/conformer Streaming/Non-Streaming with Kaldi feature
\ No newline at end of file

examples/tiny/README.md

-* s0 for deepspeech2
-* s1 for U2
+* asr0 - deepspeech2 Streaming/Non-Streaming
+* asr1 - transformer/conformer Streaming/Non-Streaming
+* asr2 - transformer/conformer Streaming/Non-Streaming with Kaldi feature

examples/wenetspeech/README.md

-# [WenetSpeech](https://github.com/wenet-e2e/WenetSpeech)
+* asr0 - deepspeech2 Streaming/Non-Streaming
+* asr1 - transformer/conformer Streaming/Non-Streaming
+* asr2 - transformer/conformer Streaming/Non-Streaming with Kaldi feature
 
-* asr1 - u2 asr model
+# [WenetSpeech](https://github.com/wenet-e2e/WenetSpeech)
 
 A 10000+ Hours Multi-domain Chinese Corpus for Speech Recognition