docs: add Arch Linux installation docs (#223)

* add Arch Linux installation

* add notice

1 files changed, 48 insertions, 0 deletions

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+# Arch Linux
+
+## Installation
+
+> [Hoarder on AUR](https://aur.archlinux.org/packages/hoarder) is not maintained by the hoarder official.
+
+1. Install hoarder
+
+    ```shell
+    paru -S hoarder
+    ```
+
+2. (**Optional**) Install optional dependencies
+
+    ```shell
+    # meilisearch: for full text search
+    paru -S meilisearch
+
+    # ollama: for automatic tagging
+    paru -S ollama
+
+    # hoarder-cli: hoarder cli tool
+    paru -S hoarder-cli
+    ```
+
+    You can use Open-AI instead of `ollama`. If you use `ollama`, you need to download the ollama model. Please refer to: [https://ollama.com/library](https://ollama.com/library).
+
+3. Set up
+
+    Environment variables can be set in `/etc/hoarder/hoarder.env` according to [configuration page](/configuration). **The environment variables that are not specified in `/etc/hoarder/hoarder.env` need to be added by yourself.**
+
+4. Enable service
+
+    ```shell
+    sudo systemctl enable --now hoarder.target
+    ```
+
+    Then visit `http://localhost:3000` and you should be greated with the Sign In page.
+
+## Services and Ports
+
+`hoarder.target` include 3 services: `hoarder-web.service`, `hoarder-works.service`, `hoarder-browser.service`. 
+
+- `hoarder-web.service`: Provide hoarder WebUI service, use `3000` port default.
+
+- `hoarder-works.service`: Provide hoarder works service, no port.
+
+- `hoarder-browser.service`: Provide browser headless service, use `9222` port default.