[Nokia N-Gage] Update README-ngage.md

Author: mupfdev

docs/README-ngage.md

@@ -1,5 +1,44 @@
-Support for the Nokia N-Gage has been removed from SDL3 (but will make a
-comeback when newer compilers are available for the platform).
+# Nokia N-Gage
 
-SDL2 still supports this platform.
+SDL port for the Nokia N-Gage [Homebrew toolchain](https://github.com/ngagesdk/ngage-toolchain) contributed by:
 
+- [Michael Fitzmayer](https://github.com/mupfdev)
+
+Many thanks to:
+
+- icculus and slouken, who faithfully kept us a place by the fireside!
+- The awesome people who ported SDL to other homebrew platforms.
+- The Nokia N-Gage [Discord community](https://discord.gg/dbUzqJ26vs)
+  who keeps the platform alive.
+- To all the staff and supporters of the
+  [Suomen pelimuseo](https://www.vapriikki.fi/nayttelyt/fantastinen-floppi/)
+  and Heikki Jungmann. You guys are great!
+
+## History
+
+After SDL support was removed because there was no support for C99 at that
+time, this version was developed from scratch after the compiler problems
+were resolved.
+
+Unlike the previous SDL2 port, this version has a dedicated rendering
+backend and a limited audio interface that works, even if it is limited.
+Support for the software renderer has been removed.
+
+The result is a much leaner, and much more performant port of SDL that
+will hopefully breathe some new life into this obscure platform - that
+we love so much.
+
+## Future prospects
+
+The revised toolchain includes EGL 1.3 and OpenGL ES 1.1. A native
+integration with SDL is being considered.
+
+## Existing Issues
+
+- If the application is put in the background while sound is playing,
+  some of the audio is looped until the app is back in focus.
+
+- It is recommended initialising SDLs audio sub-system even when it
+  is not required. The backend is started at a higher level.
+  Initialising SDLs audio sub-system ensures that the backend is
+  properly deinitialised.