libdemo to run in linux online online with Winfy

We have hosted the application libdemo to run in linux online in order to run this application in our online workstations with Wine or directly.

Quick description about libdemo to run in linux online:

'libdemo' implements several C functions and Objective-C classes which can be used to create beautiful SDL2/OpenGL2.0-based demos and games for Linux. It includes 3 examples which feature:
- 2D snow & rain;
- lightning (electrical spark) & noise effects;
- stars & meteors;
- semi-3D galaxy;
- plain C functions for matrix/vector ops - translate, scale, rotate (no glm/C++/template garbage!);
- using Vorbis & Opus decoders for playing background music and one-shot sound effects;
- using WebP images as GL textures;
- using CPIO archive as a liked-in resource container;
- using Hermit utility for creating AppImage-like standalone distributions.
This is a hobby project and was not intended to turn into something big, so don't expect too much. Also, there're no docs (sorry). However, the code is clean and doesn't use anything beyond basic Objective-C (no GNUstep is required!).

Audience: Developers, End Users/Desktop.
User interface: OpenGL.
Programming Language: C++, C, Objective C.

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