Fix crash bug, update docHEADmaster

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 The X11 bouncing DVD logo. A little gimmick for a new video.
 
 ![Screen capture of xbouncing in action](doc/animated.webp)
+
+## Cloud Demo
+If you're running Linux, you can simply use SSH X11 forwarding to try it out
+without installing anything at all. However, due to network delay, it won't be
+as smooth as running it on your machine locally.
+
+```
+ssh -X dvd@sshs.snart.me
+```
+
+If you're running Mac or Windows, you may use **XQuartz** or **Xming**.
+
+## INSTALL
+To build it from source and run it on your machine yourself,
+
+```sh
+sudo dnf install git cmake gcc libX11-devel libXrandr-devel
+
+git clone https://github.com/dxdxdt/xbouncing
+cd xbouncing
+
+cmake -B build
+cd build
+
+make
+sudo make install
+```
+
+## Usage
+```sh
+xbouncing
+```
+
+Interrupt(`Ctrl` + `C`) or terminate.