adds cell for fetching the RPM

spinnyboy_rust/src/bin/main.rs

@@ -100,6 +100,10 @@ fn main() -> ! {
     loop {
         dshot_esc.process();
         dshot_esc.set_throttle(150);
+        match dshot_esc.get_rpm() {
+            Some(x) => {rprintln!("GOT RPM {}",x)},
+            None => {rprintln!("NO RPM!")}
+        }
     }
 
     // rprintln!("RMT SENT!");