Update README to reflect recent improvements

Author: jserv

README.md

@@ -79,7 +79,13 @@ Install [Pixman](https://pixman.org/) before selecting the corresponding rendere
 * macOS: `brew install pixman`
 * Ubuntu Linux / Debian: `sudo apt install libpixman-1-dev`
 
-In the meantime, ensure that you choose a graphics backend and install the necessary packages beforehand.
+`Mado` supports multiple graphics backends. Choose one based on your deployment scenario:
+- SDL: Cross-platform desktop development with hardware acceleration
+- Linux framebuffer (fbdev): Direct hardware access for embedded Linux
+- VNC: Remote display via Virtual Network Computing protocol
+- Headless: Testing and automation without display output
+
+### Backend-Specific Dependencies
 
 For SDL backend, install the [SDL2 library](https://www.libsdl.org/).
 * macOS: `brew install sdl2`
@@ -93,13 +99,29 @@ $ tools/build-neatvnc.sh
 For Linux framebuffer backend, install `libudev` and `libuuid`:
 * Ubuntu Linux / Debian: `sudo apt install libudev-dev uuid-dev`
 
+For the headless backend, no additional dependencies are required. This backend uses shared memory for rendering and can be controlled programmatically via `headless-ctl`.
+
+For detailed information about each backend's features, use cases, and configuration options, see [docs/backends.md](docs/backends.md).
+
 ### Configuration
 
-Configure via [Kconfiglib](https://pypi.org/project/kconfiglib/), you should select either SDL video, the Linux framebuffer, or VNC as the graphics backend.
+`Mado` uses [Kconfiglib](https://github.com/sysprog21/Kconfiglib) for flexible build configuration. Choose from multiple graphics backends: SDL, Linux framebuffer, VNC, or headless (for testing/automation).
+
+For interactive configuration with a terminal menu:
 ```shell
 $ make config
 ```
 
+For quick scripted configuration (recommended for most users):
+```shell
+$ make defconfig
+$ python3 tools/kconfig/setconfig.py --kconfig configs/Kconfig \
+    BACKEND_SDL=y \
+    DEMO_MULTI=y
+```
+
+For detailed configuration options and advanced usage, see [docs/kconfig-usage.md](docs/kconfig-usage.md).
+
 ### Build and execution
 
 Build the library and demo program:
@@ -139,6 +161,19 @@ $ ./demo-vnc
 This will start the VNC server. You can use any VNC client to connect using the specified IP address (default is `127.0.0.1`) and port (default is `5900`).
 The IP address can be set using the `MADO_VNC_HOST` environment variable, and the port can be configured using `MADO_VNC_PORT`.
 
+To run demo program with the headless backend (for testing/automation):
+
+```shell
+$ ./demo-headless &
+$ ./headless-ctl status           # Check backend status
+$ ./headless-ctl shot output.png  # Capture screenshot
+$ ./headless-ctl shutdown         # Graceful shutdown
+```
+
+The headless backend uses shared memory for rendering without display output. Use `headless-ctl` to monitor, control, and capture screenshots.
+Ideal for CI/CD pipelines, automated testing, and memory debugging.
+See [docs/backends.md](docs/backends.md) for advanced usage including event injection and live monitoring.
+
 ## License
 
 `Mado` is available under a MIT-style license, permitting liberal commercial use.