Created main class with main method.

src/main/java/main/src/Main.java

@@ -0,0 +1,15 @@
+/**
+ * @author Aaron Moser
+ * @date 31.10.2023
+ */
+
+package main.src;
+
+import gui.src.frames.MainFrame;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("Hello world!");
+        MainFrame.getInstance();
+    }
+}