Update README.md for new stable ver release

README.md

@@ -27,20 +27,28 @@ Currently, the supported tensor network libraries are:
 - [quimb](https://quimb.readthedocs.io/en/latest/), an easy but fast python library for ‘quantum information many-body’ calculations, focusing primarily on tensor networks.
 
 ## Installation
-
+ 
 To get started:
-
+ 
+```sh
+pip install qibotn
+```
+ 
+to install the tools and dependencies. A few extras are provided, check `pyproject.toml` in
+case you need them.
+ 
+<!-- TODO: describe extras, after Poetry adoption and its groups -->
+ 
+## Contribute
+ 
+To contribute, please install using poetry:
+ 
 ```sh
 git clone https://github.com/qiboteam/qibotn.git
 cd qibotn
 poetry install
 ```
 
-to install the tools and dependencies. A few extras are provided, check `pyproject.toml` in
-case you need them.
-
-<!-- TODO: describe extras, after Poetry adoption and its groups -->
-
 ## Sample Codes
 
 ### Single-Node Example