added code to begin and print to display

display.ino

@@ -0,0 +1,54 @@
+/*
+This is part of RadiationMapping
+Copyright (C) 2024 Václav Šmejkal
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include "display.hpp"
+
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+
+LiquidCrystal_I2C lcd(0x27, 2, 16);
+
+namespace display
+{
+    void begin(void)
+    {
+        //INIT THE LCD ITSELF
+        Wire.begin(6, 7);
+        lcd.init();
+
+        //TURN ON THE BACKLIGHT
+        lcd.backlight();
+    }
+
+    Q
+    {
+        //CLEAR
+        lcd.clear();
+    
+        //LINE 1
+        lcd.setCursor(0, 0);
+        lcd.print(line_1);
+
+        //LINE 2
+        if (line_2 != NULL)
+        {
+            lcd.setCursor(0, 1);
+            lcd.print(line_2);
+        }
+    }
+}