Merge pull request #971 from zh794390558/demo

[WIP]asr demo

demos/echo/.gitignore

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+data

demos/echo/README.md

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+# echo system
+
+ASR + TTS

demos/echo/run.sh

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+#!/bin/bash
+
+mkdir -p data
+
+wav_en=data/en.wav
+wav_zh=data/zh.wav
+
+test -e ${wav_en}  || wget -c https://paddlespeech.bj.bcebos.com/PaddleAudio/en.wav -P data
+test -e ${wav_zh}  || wget -c https://paddlespeech.bj.bcebos.com/PaddleAudio/zh.wav -P data
+
+pip install paddlehub
+
+asr_en_cmd="import paddlehub as hub; model = hub.Module(name='u2_conformer_librispeech'); print(model.speech_recognize("${wav_en}", device='gpu'))"
+asr_zh_cmd="import paddlehub as hub; model = hub.Module(name='u2_conformer_aishell'); print(model.speech_recognize("${wav_zh}", device='gpu'))"
+
+python -c "${asr_en_cmd}"
+python -c "${asr_zh_cmd}"