Installation guide

docs/INSTALLATION_GUIDE.md

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+# Sale Dock - Installation Guide
+
+## I. Install via Docker
+
+### 1. Requirements
+
+- OS: Linux, Windows, macOS
+- Docker Desktop: [Install Docker Desktop](https://www.docker.com/products/docker-desktop)
+
+### 2. Installation
+
+- Step 1: Open Docker Desktop
+
+  | ![Docker Desktop](../imgs/1.png) |
+  | :------------------------------: |
+  |  _Image 1: Open Docker Desktop_  |
+
+- Step 2: Open your terminal
+
+  |  ![Terminal](../imgs/2.png)   |
+  | :---------------------------: |
+  | _Image 2: Open your terminal_ |
+
+- Step 3: Download `docker-compose.yml` via `curl`
+
+  ```bash
+    curl -O https://raw.githubusercontent.com/hardingadonis/saledock/main/docker-compose.yml
+  ```
+
+  |   ![Download docker compose file](../imgs/3.png)    |
+  | :-------------------------------------------------: |
+  | _Image 3: Download `docker-compose.yml` via `curl`_ |
+
+- Step 4: Run `docker-compose up -d` and wait for the installation to complete
+
+  ```bash
+    docker-compose up -d
+  ```
+
+  | ![Run docker compose](../imgs/4.png)  |
+  | :-----------------------------------: |
+  | _Image 4: Run `docker-compose up -d`_ |
+
+- Step 5: Open your browser and navigate to `http://localhost:8080/saledock`
+
+  | ![Open browser](../imgs/5.png) |
+  | :----------------------------: |
+  |  _Image 5: Open your browser_  |