inputs: serial: basic serial command inputs

src/inputs/Serial.h

@@ -1,12 +1,17 @@
+#pragma once
 #include "Particle.h"
 #include "../Figments/Figments.h"
 
 class SerialInput: public InputSource {
 public:
-    void onAttach() override {
+    void onStart() override {
         //Serial.begin();
     }
 
-    InputEvent read() {
-    }
+    InputEvent read();
+
+private:
+    String m_buf;
+    void doCommand();
+
 }