update readme (#9)

* update readme

* docker compose

README.md

@@ -23,6 +23,8 @@ Contributions for more APIs are welcome!
 | [**LINE**](https://mockapis.onrender.com/swagger#tag/line) | A mock API that implements a subset of the [LINE Messaging API](https://developers.line.biz/en/reference/messaging-api/). |
 | [**Vonage**](https://mockapis.onrender.com/swagger#tag/vonage) | A mock API that implements a subset of the [Vonage SMS API](https://developer.vonage.com/en/api/sms) for sending SMS messages. |
 | [**dtinth/kio**](https://mockapis.onrender.com/swagger#tag/dtinthkio) | A mock API that implements the endpoints expected by [dtinth/kio](https://github.com/dtinth/kio), a geeky self-checkin kiosk. |
+| [**OpnPayments**](https://mockapis.onrender.com/swagger#tag/opnpayments) | A mock API that implements a subset of the [OpnPayments API](https://docs.opn.ooo) for receiving payments. |
+| [**SMSKUB**](https://mockapis.onrender.com/swagger#tag/smskub) | A mock API that implements a subset of the [SMSKUB API](https://documenter.getpostman.com/view/9887776/VV4xvFoy#6cfa0c23-5f08-4f80-9e62-ffbf10dd75ea) for sending SMS quick messages. |
 
 <!-- end api list -->
 
@@ -42,12 +44,42 @@ You can explore the available APIs and their documentation at our demo instance:
 
 ## Running with Docker
 
-We provide a docker-compose configuration for users who would like to run the service locally without any configuration. This is useful if you have limitation connecting to external network during testing.
+### Using Pre-built Image
+
+For quick setup without building from source, you can use the pre-built Docker image. Create a `docker-compose.yml` file with the following content:
+
+```yaml
+services:
+  redis:
+    image: "redis:latest"
+  mockapis:
+    image: ghcr.io/dtinth/mockapis:main
+    environment:
+      - REDIS_URL=redis://redis:6379
+    depends_on:
+      - redis
+    ports:
+      - "46982:46982"
+```
+
+Then run:
+
+```sh
+docker compose up -d
+```
+
+This will start the Mock APIs service using the latest pre-built image from the GitHub Container Registry.
+
+### Building from Source
+
+If you plan to make changes to the Mock APIs or want to build from source, you can use the `docker-compose.yml` file provided in the repository. Clone the repository and run:
 
 ```sh
 docker compose up -d
 ```
 
+This will build the Docker image from the source code in the repository and start the service.
+
 ## Features
 
 - Multiple mock API endpoints simulating various services without the need for authentication or API keys (any key is accepted)