[docu] add docu about wsl

gitbook/installation/windows.md

@@ -1,6 +1,31 @@
 ## Installation
 
+### Using WSL
+
+On a modern Windows system with WSL2 (verified, WSL1 **might** work)
+`oidc-agent` can be used through WSL:
+
+- If not already done install WSL according to https://learn.microsoft.com/en-us/windows/wsl/install
+- Add the `oidc-agent` repo and install according to http://repo.data.kit.edu for your chosen distribution
+- Add `eval $(oidc-agent-service use)` to your `.bashrc`
+- Now `oidc-agent` and friends can be used from the WSL and windows shell as
+  used to, e.g.
+
+```shell
+# From WSL 
+oidc-token <shortname>
+
+# From Powershell
+wsl oidc-token <shortname>
+```
+
+### "Native" Installer
+
 We provide an installer for oidc-agent
 at: [http://repo.data.kit.edu/windows/oidc-agent/](http://repo.data.kit.edu/windows/oidc-agent/).
 
-The installer will install all necessary binaries and libraries and oidc-agent is ready to use.
+The installer will install all necessary binaries and libraries and oidc-agent is ready to use.
+
+We recommend to use the WSL method instead and only use this is installer if
+WSL is not possible.
+It is likely that support for this installer is dropped in the future.