App improvements (#103)

README.md

@@ -42,7 +42,7 @@ UI is created with [lvgl](https://github.com/lvgl/lvgl) which has lots of [widge
 Creating a touch-capable UI is [easy](https://docs.lvgl.io/9.0/get-started/quick-overview.html) and doesn't require your own render loop!
 
 ```C++
-static void app_show(tt::app::App app, lv_obj_t* parent) {
+static void onShow(tt::app::App app, lv_obj_t* parent) {
     // Default toolbar with app name and close button
     lv_obj_t* toolbar = tt::lvgl::toolbar_create(parent, app);
     lv_obj_align(toolbar, LV_ALIGN_TOP_MID, 0, 0);
@@ -57,7 +57,7 @@ static void app_show(tt::app::App app, lv_obj_t* parent) {
 extern const tt::app::Manifest manifest = {
     .id = "HelloWorld",    // Used to identify and start an app
     .name = "Hello World", // Shown on the desktop and app's toolbar
-    .onShow = &app_show  // A minimal setup sets the on_show() function
+    .onShow = onShow  // A minimal setup sets the onShow() function
 };
 ```