Updated README.md with better installation instructions

README.md

@@ -22,15 +22,19 @@ First, clone the git repository. Then, create a virtual environment
 ```bash
 % python3 -m venv env
 ```
-and install the necessary packages
+and activate the virtual environment
 ```bash
-% pip install numpy matplotlib scipy sklearn jupyterlab
+% source env/bin/activate
+```
+Then install the necessary packages
+```bash
+% (env) pip install numpy matplotlib scipy sklearn jupyterlab
 ```
 Now, start 'JupyterLab' (or Jupyter Notebook if you prefer) and start exploring the notebook ```main.ipynb``` in the ```code``` directory by starting
 ```bash
-% jupyter lab
+% (env) jupyter lab
 ```
 or 
 ```bash
-% jupyter notebook
+% (env) jupyter notebook
 ```