implemented keymap struct

src/rgb.rs

@@ -0,0 +1,11 @@
+pub struct Rgb {
+    pub red: u8,
+    pub green: u8,
+    pub blue: u8,
+}
+
+impl Rgb {
+    pub fn to_array(self) -> [u8; 3] {
+        [self.red, self.green, self.blue]
+    }
+}