docs: explain how to run other demos and examples (#81)

README.md

@@ -85,6 +85,30 @@ cmake ..
 make -j
 ```
 
+## Run demos and examples
+
+By default, the widgets demo (`lv_demo_widgets()`) will run. If you want to run a different demo or example from the LVGL library,
+simply replace the demo function call in the code with another one—such as `lv_demo_benchmark()` or `lv_example_label_1()`.
+
+```c
+int main(int argc, char **argv)
+{
+  /* ... */
+  /* Run the default demo */
+  /* To try a different demo or example, replace this with one of: */
+  /* - lv_demo_benchmark(); */
+  /* - lv_demo_stress(); */
+  /* - lv_example_label_1(); */
+  /* - etc. */
+  lv_demo_widgets(); 
+
+  while(1) {
+      /* ... */
+  }
+  return 0;
+}
+```
+
 ## Optional library
 
 There are also FreeType and FFmpeg support. You can install these according to the followings:

main/src/main.c

@@ -76,6 +76,12 @@ int main(int argc, char **argv)
 
   #if LV_USE_OS == LV_OS_NONE
 
+  /* Run the default demo */
+  /* To try a different demo or example, replace this with one of: */
+  /* - lv_demo_benchmark(); */
+  /* - lv_demo_stress(); */
+  /* - lv_example_label_1(); */
+  /* - etc. */
   lv_demo_widgets();
 
   while(1) {