feat(display): expose LCD member

include/display.hpp

@@ -10,6 +10,9 @@ class Display {
     Display(uint8_t addr = 0x27, uint8_t cols = 20, uint8_t rows = 4);
 
     void begin();
+    void clear();
+
+    LiquidCrystal_I2C& getLCD();
   private:
     LiquidCrystal_I2C lcd;
 };

src/display.cpp

@@ -8,4 +8,10 @@ void Display::begin() {
   lcd.backlight();
 }
 
+void Display::clear() {
+  lcd.clear();
+}
 
+LiquidCrystal_I2C& Display::getLCD() {
+  return lcd;
+}