Add run.sh.

demos/audio_tagging/run.sh

+#!/bin/bash
+
+wget -c https://paddlespeech.bj.bcebos.com/PaddleAudio/cat.wav https://paddlespeech.bj.bcebos.com/PaddleAudio/dog.wav
+paddlespeech cls --input ./cat.wav --topk 10

demos/speech_recognition/run.sh

+#!/bin/bash
+
+wget -c https://paddlespeech.bj.bcebos.com/PaddleAudio/zh.wav https://paddlespeech.bj.bcebos.com/PaddleAudio/en.wav
+paddlespeech asr --input ./zh.wav

demos/speech_translation/run.sh

+#!/bin/bash
+
+wget -c https://paddlespeech.bj.bcebos.com/PaddleAudio/zh.wav https://paddlespeech.bj.bcebos.com/PaddleAudio/en.wav
+paddlespeech st --input ./en.wav

demos/text_to_speech/run.sh

+#!/bin/bash
+
+paddlespeech tts --input 今天的天气不错啊