UserInterface with TextMessages implemented.

js/ui/UserInterface.js

@@ -0,0 +1,25 @@
+export default class UserInterface
+{
+    constructor()
+    {
+        this.textBoxes = [];
+    }
+
+    addTextBox(textBox)
+    {
+        this.textBoxes.push(textBox);
+
+        return this.textBoxes.length - 1;
+    }
+
+    draw(context)
+    {
+        this.textBoxes.forEach(
+            (textBox) => {
+                if (textBox.isVisible) {
+                    textBox.draw(context);
+                }
+            }
+        )
+    }
+}