Update README and add GitHub build workflow.

.github/workflows/build.yaml

@@ -0,0 +1,34 @@
+name: build
+on: [push, pull_request]
+jobs:
+  build-deb:
+    strategy:
+      matrix:
+        container: ['ubuntu:jammy', 'ubuntu:noble', 'debian:bookworm']
+    runs-on: ubuntu-latest
+    container: ${{ matrix.container }}
+    steps:
+      - uses: actions/checkout@v4
+      - run: apt-get update
+      - run: apt-get install -y build-essential pkg-config libx11-dev libgoogle-glog-dev
+      - run: make
+  build-rpm:
+    strategy:
+      matrix:
+        container: ['fedora:latest']
+    runs-on: ubuntu-latest
+    container: ${{ matrix.container }}
+    steps:
+      - uses: actions/checkout@v4
+      - run: yum install -y make gcc gcc-c++ libX11-devel glog-devel
+      - run: make
+  build-arch:
+    strategy:
+      matrix:
+        container: ['archlinux:base']
+    runs-on: ubuntu-latest
+    container: ${{ matrix.container }}
+    steps:
+      - uses: actions/checkout@v4
+      - run: pacman -Sy --noconfirm base-devel libx11 google-glog
+      - run: make

README.md

@@ -1,49 +1,46 @@
-Basic Window Manager
-====================
+# Basic Window Manager
 
 basic_wm is a simple reparenting, non-compositing X window manager that demonstrates
 how to implement the fundamental functionality of a window manager:
 
-  * Managing the life cycle of windows
-  * Reparenting windows
-  * Basic window operations (moving, resizing, closing)
+- Managing the life cycle of windows
+- Reparenting windows
+- Basic window operations (moving, resizing, closing)
 
 It serves as a pedagogical example for my series of articles,
 [_How X Window Managers Work, And How To Write One_](https://jichu4n.com/posts/how-x-window-managers-work-and-how-to-write-one-part-i/).
 
-
-Building and Running
---------------------
+## Building and Running
 
 To build this example window manager, you will need:
 
-* A C++-11 enabled C++ compiler
-* [GNU Make](https://www.gnu.org/software/make/)
-* Xlib headers and libraries
-* [google-glog](https://code.google.com/p/google-glog/) library
+- A C++-11 enabled C++ compiler
+- [GNU Make](https://www.gnu.org/software/make/)
+- Xlib headers and libraries
+- [google-glog](https://code.google.com/p/google-glog/) library
 
 To run and test it, you will need:
 
-* [Xephyr](http://www.freedesktop.org/wiki/Software/Xephyr/)
-* `xinit`
-* Random X utilities such as `xclock`, `xeyes`, and `xterm` to play with
+- [Xephyr](http://www.freedesktop.org/wiki/Software/Xephyr/)
+- `xinit`
+- Random X utilities such as `xclock`, `xeyes`, and `xterm` to play with
 
-On [Ubuntu](https://www.ubuntu.com)/[Debian](https://www.debian.org/), you can
+On [Ubuntu](https://www.ubuntu.com) / [Debian](https://www.debian.org/), you can
 install these dependencies with:
 
     sudo apt-get install \
-        build-essential libx11-dev libgoogle-glog-dev \
+        build-essential pkg-config libx11-dev libgoogle-glog-dev \
         xserver-xephyr xinit x11-apps xterm
 
-On [Fedora](https://getfedora.org)/[CentOS](https://www.centos.org), you can install these with:
+On [Fedora](https://getfedora.org), you can install these with:
 
     sudo yum install \
         make gcc gcc-c++ libX11-devel glog-devel \
         xorg-x11-server-Xephyr xorg-x11-apps xterm
 
 On [Arch Linux](http://www.archlinux.org), you can install these with:
 
-    yaourt -S base-devel libx11 google-glog \
+    sudo pacman -S base-devel libx11 google-glog \
         xorg-server-xephyr xorg-xinit xorg-xclock xorg-xeyes xterm
 
 Consult your own distro's documentation for how to install these.
@@ -55,14 +52,11 @@ Once you have all the dependencies, building and running it is as simple as:
 This will launch a simple Xephyr session like in the following screenshot:
 ![Screenshot](basic_wm_screenshot.png)
 
-
-Usage
------
+## Usage
 
 Supported keyboard shortcuts:
 
-* **Alt + Left Click**: Move window
-* **Alt + Right Click**: Resize window
-* **Alt + F4**: Close window
-* **Alt + Tab**: Switch window
-
+- **Alt + Left Click**: Move window
+- **Alt + Right Click**: Resize window
+- **Alt + F4**: Close window
+- **Alt + Tab**: Switch window