Adding support for a configuration file

README.md

@@ -270,6 +270,11 @@ debugging enabled.)
    `/sdcard/questshock/res/`.
 4. Launch it again.
 
+`/sdcard/questshock/` also holds an optional persistent settings file,
+`questshock.config.json`, loaded automatically at startup and saved/loaded
+from the in-headset menu - see [CONFIG.md](CONFIG.md) for the documented
+options.
+
 ### 5.2. Building natively in Android Studio
 
 `make apk` always compiles the engine and links the APK inside the
@@ -508,6 +513,11 @@ each one does:
   goes through the OpenXR swapchain's own FBOs, set up separately in
   `xr_swapchain.c`) and is also functionally dead there regardless -
   skipped entirely, Android-only.
+- **`21-android-config.patch`** - hooks up the persistent JSON config file
+  (see [CONFIG.md](CONFIG.md), `qs_config.c`): one call to
+  `qs_config_load_startup()` in `Shock.c`'s `main()`, right after
+  `LoadPrefs()`, and one check in `sdl_events.c`'s `pump_events()` to drain
+  the custom SDL events the menu's Save/Load Configuration buttons enqueue.
 
 `android/gl4es-patches/`: