Docker for developers

[MostlyKIGuess]

Summary

This pull request introduces Docker support to simplify the developer setup process for the project. It addresses #601 and provides a streamlined way to run the server without manually managing dependencies.

Changes Made

• Added a Dockerfile that builds an environment for running the server.
• Included a docker-compose.yml file for easier container management (if applicable).
• Updated documentation (README.md) with clear instructions on building and running the Docker container.

Testing

• Verified the Docker container builds and runs the server correctly on Linux, Windows.
• Haven't tested on macOS yet.

Benefits

• Simplifies the server setup process for contributors.
• Resolves potential dependency issues during setup.
• Enhances the developer experience by providing a robust and consistent environment.

[MostlyKIGuess]

Also added .bundle to gitignore which is created when testing locally by using bundle install.