install virtualenv

To install `virtualenv`, you can follow these steps:

1. **Check if Python is installed**: Ensure that you have Python on your system. You can do this by opening a terminal or command prompt and running `python --version` or `python3 --version`.

2. **Install pip**: If you don't have `pip`, the package installer for Python, run the following commands to install it (assuming you have Python 3):

   curl https://bootstrap.pypa.io/get-pip.py | python3

3. **Create a new environment**: Once `pip` is installed, use `virtualenv` to create a new virtual environment. Run the following command in your project directory where you want to set up the environment:

   pip install virtualenv

Or, if you're using Python 2, use:

   easy_install virtualenv

4. **Activate the environment**: After installation, activate the virtual environment by running the appropriate command for your platform:
- On Windows with PowerShell:

     .\Scripts\activate

- On Windows with Command Prompt:

     Scripts\activate

- On macOS/Linux with Bash shell:

     source bin/activate

5. **Verify installation**: To ensure that the virtual environment is activated, type `which python`. It should show the path to the Python interpreter inside the virtual environment.

That's it! Now you have a separate environment isolated from your global Python installation, allowing you to manage different packages for different projects.