add images

README.md

@@ -1,2 +1,13 @@
 # rotary-kb
 A minimal keyboard consisting only of a rotary encoder with a button
+
+The treeboard:  
+Currently selected key is highlighted with a `)`
+
+<img src="images/treeboard.png" alt=""/>
+
+The finished circuit:  
+<img src="images/completed-circuit.png" alt=""/>
+
+I sacrificed one Lego piece to make it fit on, now I can attach a Lego wheel to it.  
+Since pressing the button takes a bit too much force, there is also a Lego 3x1 brick under the encoder which supports it so that the pins don't take all the load.

treeboard/src/main.rs

@@ -7,7 +7,7 @@ fn main() {
 	println!("Connecting to arduino on port {}...", port);
 	let connection = serial::open(port);
 	if connection.is_err() {
-		println!("Connection failed {}", connection.err().unwrap());
+		println!("Connection failed: {}", connection.err().unwrap());
 		return;
 	}