added simple keyboard control

src/KeyboardController.h

@@ -0,0 +1,26 @@
+
+#pragma once
+
+#include <QKeyEvent>
+#include <unordered_map>
+
+#include "NoteQueue.h"
+
+// The keyboardcontroller handles user inputs from a keyboard and maps them to note events
+class KeyboardController {
+
+public:
+    explicit KeyboardController(NoteQueue& queue);
+    ~KeyboardController() = default;
+
+    void handleKeyPress(QKeyEvent* e);
+    void handleKeyRelease(QKeyEvent* e);
+
+private:
+
+    NoteQueue& queue_;
+
+    // keymap is key -> midi note id
+    std::unordered_map<int32_t, uint8_t> keymap_;
+
+};