Document how to use Ansible on Windows (#247)

ansible/README.md

@@ -4,16 +4,21 @@ This folder contains Ansible roles which are used to configure out bare metal se
 
 ## Local Environment Setup
 
-To setup a local environment using VMs for testing, [Read here](./local_testing/README.md)
+If you are on Windows, you need to install WSL and run Ansible in there, as
+[Ansible cannot run on Windows hosts
+natively](https://docs.ansible.com/ansible/latest/user_guide/windows_faq.html#can-ansible-run-on-windows).
+Debian Stable is recommended, but any Linux distribution should work.
 
 1. Create a virtual environment: `python -m venv venv`
 1. Activate the virtual environment
-   - Windows: `.\venv\Scripts\activate`
-    - Note: [Ansible cannot run on Windows hosts natively](https://docs.ansible.com/ansible/latest/user_guide/windows_faq.html#can-ansible-run-on-windows)
-   - Unix: `source venv/bin/activate`
 1. Update pip and builder deps: `python -m pip install --upgrade pip wheel setuptools`
 1. Install project dependencies: `python -m pip install -r requirements.txt`
 1. Install the pre-commit hook: `pre-commit install`
 1. Create a `vault_passwords` file and write the vault password to it
 1. Configure the Ansible Vault git diff driver using `git config --global
    diff.ansible-vault.textconv "ansible-vault view"` and `git config diff.ansible-vault.cachetextconv false`
+
+## Testing on Virtual machines
+
+To setup a local environment using VMs for testing, [see the `local_testing`
+directory](./local_testing/README.md).