kms: Add kms backend module

src/backend/kms/mod.rs

@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-3.0-only
+
+use crate::state::State;
+use anyhow::Result;
+use smithay::reexports::calloop::EventLoop;
+
+pub struct KmsState {}
+
+pub fn init_backend(event_loop: &mut EventLoop<State>, state: &mut State) -> Result<()> {
+    unimplemented!()
+}