docs: add CLI usage and integrate generation in release

www/docs/cli/filebrowser-completion-powershell.md

@@ -0,0 +1,38 @@
+# filebrowser completion powershell
+
+Generate the autocompletion script for powershell
+
+## Synopsis
+
+Generate the autocompletion script for powershell.
+
+To load completions in your current shell session:
+
+	filebrowser completion powershell | Out-String | Invoke-Expression
+
+To load completions for every new session, add the output of the above command
+to your powershell profile.
+
+
+```
+filebrowser completion powershell [flags]
+```
+
+## Options
+
+```
+  -h, --help              help for powershell
+      --no-descriptions   disable completion descriptions
+```
+
+## Options inherited from parent commands
+
+```
+  -c, --config string     config file path
+  -d, --database string   database path (default "./filebrowser.db")
+```
+
+## See Also
+
+* [filebrowser completion](filebrowser-completion.md)	 - Generate the autocompletion script for the specified shell
+