Update README.md

Add more explanation of the demos readme.

demos/metaverse/README.md

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 # Metaverse
+
+## Introduction
+This demo is an implementation to let a celebrity in an image "speak". With the composition of PaddleSpeech and PaddleGAN, we integrate the installation and the specific modules in a single shell script. 
+
+## How to use our code
+
 You can make your favorite person say the specified content with the `TTS` mudule of `PaddleSpeech` and `PaddleGAN`, and construct your own virtual human.
 
-Run the following command line to get started:
+First, locate the directory you would like to run our code, and set the environment variants. 
+```shell
+./path.sh
 ```
+Download the celebrity image in the current directory, in our case we use `Lamarr.png`.
+
+Second, run `run.sh` to complete all the essential procedures, including the installation.  
+
+```shell
 ./run.sh
 ```
+If you would like to try your own image, please replace the image name in the shell script.
+
+The result has shown on our notebook[]().