feat: add install via package manager for Arch Linux in README (#52)

README.md

@@ -26,6 +26,7 @@
         - [Install ONNX Runtime](#install-onnx-runtime)
         - [Install dependencies](#install-dependencies)
     - [Compile and Install](#compile-and-install)
+- [Install via a package manager]
 - [Run the server](#run-the-server)
 - [Docker](#docker)
 - [API](#api)
@@ -92,6 +93,14 @@ sudo cmake --install build --prefix /usr/local/onnxruntime-server
 
 ----
 
+# Install via a package manager
+
+| OS                            | Method     | Command                                    |
+|-------------------------------|------------|--------------------------------------------|
+| Arch Linux                    | AUR        | `yay -S onnxruntime-server`                |
+
+----
+
 # Run the server
 
 - **You must enter the path option(`--model-dir`) where the models are located.**