Add class for converting Bitmaps to monochrome bytes representation

src/graphics/Monochrome.hpp

@@ -0,0 +1,20 @@
+#include <cstdint>
+
+#include "graphics/Bitmap.hpp"
+
+namespace ptprnt::graphics {
+class Monochrome {
+   public:
+    Monochrome(const std::vector<uint8_t>& grayscale);
+    ~Monochrome() = default;
+
+    void setThreshold(uint8_t);
+    void invert(bool shouldInvert);
+    std::vector<uint8_t> get();
+
+   private:
+    const std::vector<uint8_t>& mPixels;
+    uint8_t mThreshhold = 127;
+    bool mShouldInvert  = false;
+};
+}  // namespace ptprnt::graphics