the sample apps aren't user-friendly

[stephengold]

For many newcomers, the sample apps in the jme3-examples sub-project (the "JME3 Tests" project in the SDK) serve as an introduction to JME's capabilities.

As @nav9 recently reminded us (at issue #1124), the sample apps could be a lot more user-friendly. In many cases, the best way to figure out what the apps do is to read the source code.

It would be helpful if more of the sample apps displayed:

1. a brief description of the purpose of the app
2. hints/reminders as to which keys/buttons do what

[pavly-gerges]

Hello,

I guess this is related to some UI work to guide users to control the testcase, here is a suggestion:

1. Display a simple bitmap component (Text + Background quad) at the beginning of testcases to add a brief description of the techdemo.
2. Display a bitmap group component (an array of bitmap components) at the far right bottom of the screen as a guide for game controls.

Do we have any issues with creating a BitmapComponent and a BitmapComponentGroup helper classes ? They will serve as layout classes for the purpose of this issue.

May be we can add them on a new package helpers at jme3test.

EDIT:

It will be something similar to the onscreen keyboard layout control provided by the GNOME-desktop environment, but we will show only the buttons of interest.