Initial node implementation (#4)

Reviewed-on: #4
Co-authored-by: Zack <zack@bfpower.io>
Co-committed-by: Zack <zack@bfpower.io>

src/transducer/output.rs

@@ -0,0 +1,8 @@
+use crate::transducer::InvalidValue;
+
+pub trait Output {
+    type Value: Copy;
+
+    //TODO: Should this be maybe async?
+    fn output(&mut self, setting: Self::Value) -> Result<(), InvalidValue>;
+}