Resolve "Set up Firebase"

Closes #5 (closed)

android/src/com/wordbattle/game/AndroidInterfaceClass.java

+package com.wordbattle.game;
+
+import com.google.firebase.database.DatabaseReference;
+import com.google.firebase.database.FirebaseDatabase;
+import com.wordbattle.game.network.FirebaseInterface;
+
+public class AndroidInterfaceClass implements FirebaseInterface {
+
+    FirebaseDatabase database;
+    DatabaseReference myRef;
+
+
+
+
+    public AndroidInterfaceClass() {
+         database = FirebaseDatabase.getInstance("https://wordbattle-96156-default-rtdb.europe-west1.firebasedatabase.app");
+         myRef = database.getReference("message");
+         myRef.setValue("HelloWorld");
+    }
+    @Override
+    public void SomeFunction() {
+        System.out.println("Something works");
+    }
+}