Add usages instructions to README

README.md

@@ -2,12 +2,74 @@
 
 Difficalcy is an osu! difficulty and performance calculator REST API.
 
-## Usage
+## Basic usage
 
-TODO: docker image usage instructions
+1.  Run the container
+    ```sh
+    docker run -p 5000:80 ghcr.io/syriiin/difficalcy-osu:latest
+    ```
+1.  Query the API
+
+    ```sh
+    curl "localhost:5000/api/calculator/info"
+    ```
+
+    ```json
+    {
+      "rulesetName": "osu!",
+      "calculatorName": "Official osu!",
+      "calculatorPackage": "osu.Game.Rulesets.Osu",
+      "calculatorVersion": "2023.1114.1.0",
+      "calculatorUrl": "https://nuget.org/packages/ppy.osu.Game.Rulesets.Osu/2023.1114.1.0"
+    }
+    ```
+
+    ```sh
+    curl "localhost:5000/api/calculator/calculation?BeatmapId=658127"
+    ```
+
+    ```json
+    {
+      "difficulty": {
+        "aim": 3.471503344019442,
+        "speed": 3.4738667283055444,
+        "flashlight": 4.58994045567377,
+        "total": 7.255439646986892
+      },
+      "performance": {
+        "aim": 220.83646290283872,
+        "speed": 231.26239294786578,
+        "accuracy": 142.3199671239901,
+        "flashlight": 0,
+        "total": 614.5217398659557
+      }
+    }
+    ```
+
+## Example docker compose setup
+
+```yaml
+services:
+  difficalcy-osu:
+    image: ghcr.io/syriiin/difficalcy-osu:latest
+    environment:
+      - REDIS_CONFIGURATION=cache:6379
+    ports:
+      - "5000:80"
+    volumes:
+      - beatmaps
+    depends_on:
+      - cache
+
+  cache:
+    image: redis:latest
+
+  volumes:
+    beatmaps:
+```
 
 ## Development Setup
 
 ```sh
-$ make start-dev
+make start-dev
 ```