feat(ui): add Lobby and Main Menu Body (#38)

Co-authored-by: LQ63 <lkhermann@web.de>
Reviewed-on: #38
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

knockoutwhistweb/app/views/mainmenu/creategame.scala.html

@@ -0,0 +1,32 @@
+@(user: Option[model.users.User])
+
+@main("Create Game") {
+@navbar(user)
+<form action="@routes.MainMenuController.createGame()" method="post" class="game-field-background">
+    <div class="w-50 mx-auto">
+        <div class="mt-3">
+            <label for="lobbyname" class="form-label">Lobby-Name</label>
+            <input type="text" class="form-control" id="lobbyname" name="lobbyname" placeholder="Lobby 1" required>
+        </div>
+        <div class="form-check form-switch mt-3">
+            <input class="form-check-input" type="checkbox" id="visibilityswitch" disabled>
+            <label class="form-check-label" for="visibilityswitch">public/private</label>
+        </div>
+            <div class="mt-3">
+                <label for="playeramount" class="form-label">Playeramount:</label>
+                <input type="range" class="form-range text-body" min="2" max="7" value="2" id="playeramount" name="playeramount">
+                <div class="d-flex justify-content-between">
+                    <span>2</span>
+                    <span>3</span>
+                    <span>4</span>
+                    <span>5</span>
+                    <span>6</span>
+                    <span>7</span>
+                </div>
+            </div>
+        <div class="mt-3 text-center">
+            <button type="submit" class="btn btn-success">Create Game</button>
+        </div>
+    </div>
+</form>
+}