docs: add install document

README.md

@@ -11,4 +11,4 @@ from proxy server goes to WireGuard network.
 In local exit mode, the proxy is served on WireGuard network, and the traffic
 from WireGuard goes to local network.
 
-For detail usage, see <https://github.com/zhsj/wghttp/tree/master/docs>.
+For detailed usage, see <https://github.com/zhsj/wghttp/tree/master/docs>.

docs/install.md

@@ -0,0 +1,25 @@
+# Install
+
+## From source
+
+```bash
+go install github.com/zhsj/wghttp@latest
+```
+
+## Docker
+
+Docker images are publish at:
+
+- [Docker Hub](https://hub.docker.com/r/zhusj/wghttp)
+
+  ```bash
+  docker pull zhusj/wghttp:latest
+
+  ```
+
+- [GitHub](https://github.com/zhsj/wghttp/pkgs/container/wghttp)
+
+  ```bash
+  docker pull ghcr.io/zhsj/wghttp:latest
+
+  ```