first copmmit debut menu

app/src/main/java/com/example/mastermind/MainActivity.java

@@ -0,0 +1,13 @@
+package com.example.mastermind;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+public class MainActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+    }
+}