Added Command for windows VENV activation in installation docs (#18008)

* Added command for windows VENV activation

* changed linux and macos  specification

docs/source/en/installation.mdx

@@ -34,11 +34,16 @@ Start by creating a virtual environment in your project directory:
 python -m venv .env
 ```
 
-Activate the virtual environment:
+Activate the virtual environment. On Linux and MacOs:
 
 ```bash
 source .env/bin/activate
 ```
+Activate Virtual environment on Windows
+
+```bash
+.env/Scripts/activate
+```
 
 Now you're ready to install 🤗 Transformers with the following command: