Update README.md

Author: js1010

README.md

@@ -4,6 +4,13 @@ This project is to speed up various ML models (e.g. topic modeling, word embeddi
 
 ### How to install
 
+- install from pypi
+
+```shell
+pip install cusim
+```
+
+
 - install from source
 
 ```shell
@@ -20,8 +27,6 @@ python -m grpc_tools.protoc --python_out cusim/ --proto_path cusim/proto/ config
 python setup.py install
 ```
 
-- pip installation will be available soon
-
 ### How to use
 
 - `examples/example_w2v.py`, `examples/example_lda.py` and `examples/README.md` will be very helpful to understand the usage.