doc: Update README.md to instruct installation

Author: TrafalgarZZZ

README.md

@@ -10,18 +10,9 @@ This Python package is automatically generated by the [OpenAPI Generator](https:
 ### pip install
 
 ```sh
-pip install git+https://github.com/fluid-cloudnative/fluid-client-python.git
+pip install fluid-pysdk
 ```
-(you may need to run `pip` with root permission: `sudo pip install git+https://github.com/fluid-cloudnative/fluid-client-python.git`)
-
-### Setuptools
-
-Install via [Setuptools](http://pypi.python.org/pypi/setuptools).
-
-```sh
-python setup.py install --user
-```
-(or `sudo python setup.py install` to install the package for all users)
+(you may need to run `pip` with root permission: `sudo pip install fluid-pysdk`)
 
 ## Getting Started