Adding doc changes

Author: michaelthomasletts

README.md

@@ -41,4 +41,4 @@ s3_client = session.session.client(service_name="s3")
 
 ## Contributing
 
-Refer to [this document](https://github.com/michaelthomasletts/boto3-refresh-session/blob/main/docs/contributing.md) for instructions.
+Refer to [this document](https://github.com/michaelthomasletts/boto3-refresh-session/blob/main/docs/contributing.md) for step by step instructions.

docs/contributing.md

@@ -12,6 +12,12 @@ Install poetry. Follow the instructions to do that [here](https://python-poetry.
 $ poetry install
 ```
 
+Install the pre-commit scripts like so.
+
+```bash
+$ pre-commit install`
+```
+
 Make your changes.
 
 ## Testing