Add daemon crate skeleton

daemon/src/main.rs

@@ -0,0 +1,12 @@
+use anyhow::Result;
+use tracing::info;
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(tracing_subscriber::EnvFilter::from_default_env())
+        .init();
+    info!("ubuntu-fidod {} starting", env!("CARGO_PKG_VERSION"));
+    // D-Bus service registration in Phase 1.
+    Ok(())
+}