Added the methods that UserDatabase must implement

Author: Madhavan7

src/main/java/UserAccounts.csv

@@ -0,0 +1,3 @@
+public interface UserCreator {
+    void createUser();
+}

src/main/java/UserCreator.java

@@ -0,0 +1,11 @@
+public class UserDatabase implements UserRegPresenter, UserCreator{
+    @Override
+    public boolean UserExists() {
+        return false;
+    }
+
+    @Override
+    public void createUser() {
+
+    }
+}

src/main/java/UserDatabase.java

@@ -0,0 +1,3 @@
+public interface UserRegPresenter {
+    boolean UserExists();
+}