Update README.md with usage information

README.md

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+# Install WSL2
+These scripts enable WSL2 on Windows and downloads/installs Debian without the need to interact with the Microsoft Store.
+
+This is based on the instructions provided here: https://docs.microsoft.com/en-us/windows/wsl/install-win10#manual-installation-steps
+
+> Note: There are 2 separate manual stages because on my machine I'm not allowed to create a `Workflow` that does a `Register-ScheduledJob` to continue working after a restart.
+
+## How to use:
+* Open a `PowerShell`-terminal, and run `stage1`:
+    ```
+    iwr https://raw.githubusercontent.com/irsital/install-wsl2/main/stage1.ps1 | iex
+    ```
+* ***Restart machine***
+* Open a `PowerShell`-terminal, and now run `stage2`
+    ```
+    iwr https://raw.githubusercontent.com/irsital/install-wsl2/main/stage2.ps1 | iex
+    ```