Add main

Group21_Lab06_Task2/main.c

@@ -106,6 +106,13 @@ void GPIOF_interruptHandler(void) {
     }
 }
 
-
+int main(void) {
+    GPIO_PORT_F_init(); // GPIO initialization function
+    systick_setting(); // SysTick setup
+
+    while (1) {
+        // Main loop does nothing; everything is handled in interrupts
+    }
+}