Add README

README.md

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+# aws-checker
+
+`aws-checker` is a long-running application that checks accessibility to various AWS services.
+
+It exposes metrics compliant with the Prometheus exposition format so that you can monitor
+if the checker, and hence your infrastructure, the platform running it, and the settings provided to the checker, is able to access the AWS services like:
+
+- DynamoDB
+- S3
+- SQS
+
+## Running locally
+
+1. Grab the latest release for your os/arch from [releases](https://github.com/chatwork/aws-checker/releases).
+2. Extract the tarball:
+    ```sh
+    tar -xzf aws-checker_<version>_<os>_<arch>.tar.gz
+    ```
+3. Run the application:
+    ```sh
+    ./aws-checker
+    ```
+4. The application will start and expose metrics at `http://localhost:8080/metrics`.
+
+You can then use Prometheus or any other compatible monitoring tool to scrape the metrics from this endpoint.
+
+## Run via docker
+
+We publish the container images at https://github.com/chatwork/aws-checker/pkgs/container/aws-checker.
+
+Use it for running the aws-checker within a container locally:
+
+```
+docker run -p 8080:8080 ghcr.io/chatwork/aws-checker:canary
+```
+
+Or in a Kubernetes pod.
+
+## Running locally for development
+
+To run `aws-checker` locally, follow these steps:
+
+1. Ensure you have Go installed on your machine.
+2. Clone the repository and navigate to the project directory.
+3. Build the project:
+    ```sh
+    go build -o aws-checker
+    ```
+4. Run the application:
+    ```sh
+    ./aws-checker
+    ```
+
+The application will start and expose metrics at `http://localhost:8080/metrics`.
+
+## Contributing
+
+We welcome contributions to `aws-checker`!
+
+Before submitting a pull request, we appreciate you to Write an issue describing the feature or bugfix you plan to work on and discuss it with the maintainers.
+
+To contribute code changes, follow these steps:
+
+1. Fork the repository on GitHub.
+2. Clone your forked repository to your local machine:
+    ```sh
+    git clone https://github.com/<your-username>/aws-checker.git
+    ```
+3. Create a new branch for your feature or bugfix:
+    ```sh
+    git checkout -b my-feature-branch
+    ```
+4. Read the [LICENSE](LICENSE) file to understand the project's licensing terms.
+5. Make your changes and commit them with descriptive commit messages:
+    ```sh
+    git add .
+    git commit -m "Description of your changes"
+    ```
+6. Push your changes to your forked repository:
+    ```sh
+    git push origin my-feature-branch
+    ```
+7. Open a pull request on the main repository and describe your changes.
+
+Please ensure your code follows the project's coding standards and includes appropriate tests.