chore: update README

Author: Decodetalkers

README.md

@@ -1,3 +1,28 @@
 # Session-lock binding for Qt
 
-I want to write a qml lock for sway, so I make this binding, but it still has some problems, like use qtimer to wait surface to finished. so this repo need some help
+This lib is the binding of ext-session-lock, for qt. This repo is used to build a lock program for wayland wm.
+
+## Dependiences
+
+If you are using archlinux, In order to build this lib, you need to run
+
+```bash
+sudo pacman -S cmake base-devel qt6-wayland
+```
+
+## Usage in cmake
+
+```cmake
+find_package(SessionLockQt REQUIRED)
+
+target_link_libraries(YourProgram PRIVATE
+  Qt6::Quick
+  Qt6::WaylandClient
+  SessionLockQt::Interface
+)
+```
+
+
+## Example repo
+
+[waycratelock](https://github.com/waycrate/waycratelock)