add introduction at noobspawn

ReallifeGamemode.Client/assets/js/Introduction/application.js

@@ -0,0 +1,25 @@
+
+let close = document.getElementById('close');
+
+close.onclick = function closeWindow() {
+    mp.trigger('removeIntroduction');
+    console.log('Fenster geschlossen!');
+}
+
+
+/* Enter wird im Input-Feld gedrückt */
+input.onkeyup = e => {
+    let code = e.keyCode ? e.keyCode : e.which;
+    if (code === 13) {
+        // TODO: Wert entgegennehmen
+        closeWindow();
+    }
+}
+
+/* ESC wird gedrückt */
+document.onkeyup = e => {
+    let code = e.keyCode ? e.keyCode : e.which;
+    if (code === 27) { closeWindow(); }
+}
+
+close.onclick = e => { closeWindow(); }