Add initial project structure and implement async main for Pico W

src/lib.rs

@@ -0,0 +1,4 @@
+#![no_std]
+
+// Logic and hardware-independent code goes here.
+// This allows you to run `cargo test` on your host machine.

src/main.rs

@@ -1,3 +1,11 @@
-fn main() {
-    println!("Hello from Rust skeletal app. Edit src/main.rs to get started!");
+#![no_std]
+#![no_main]
+
+use defmt_rtt as _;
+use panic_probe as _;
+use embassy_executor::Spawner;
+
+#[embassy_executor::main]
+async fn main(_spawner: Spawner) {
+    defmt::info!("Hello from the Pico W!");
 }

src/net/mod.rs

@@ -0,0 +1,2 @@
+mod mqtt;
+mod wifi;