feat: Add powershell documentation

powershell/POWERSHELL.md

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+# Powershell
+
+## `add-usertogroupwithlicense.ps1`
+
+This script is used to add a user to a license group and an application group in the local active directory.
+
+### Usage
+
+```powershell
+.\add-usertogroupwithlicense.ps1
+```
+
+### Variables
+
+- `dn`: The domain name of the local active directory.
+- `license_group`: The name of the license group.
+- `application_group`: The name of the application group.
+- `user`: The name of the user to add to the groups.
+
+## `add-usertogroupwithlicense.ps1`
+
+This script is used to add a user to a license group and an application group in the local active directory.