docs: 📝 Adds license and README with usage examples

This commit adds the MIT license file and the start of a extensive README.md file as a starting point for using the Docker images and binaries as well as instructions for building those yourselfs.

LICENSE

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+MIT License
+
+Copyright (c) 2024 Florian Beisel
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Gitea account registration Bot for Discord
+
+This repository contains the source code for a Discord bot that interacts with Gitea to allow user self-registration from
+within Discord. It's designed to work across multiple platforms, including Docker, Windows, Linux, and macOS.
+
+## Description
+
+This Discord bot is designed to react to commands on Discord and interact with the Gitea API to create and manage user
+accounts. It currently supports the `!register` command to facilitate user registration through Discord.
+
+## Environment Variables
+
+The bot requires the following environment variables to be set:
+
+- `DISCORD_TOKEN`: The token for your Discord bot.
+- `GITEA_TOKEN`: The API token for accessing Gitea.
+- `GITEA_URL`: The base URL of your Gitea instance.
+
+## Build it yourself
+
+To build the bot from source, follow these steps:
+
+1. Clone the repository:
+
+   ```bash
+   git clone https://git.beisel.it/beisel.org/gitea-register-account-bot.git
+   ```
+
+2. Navigate to the cloned directory:
+
+   ```bash
+   cd gitea-register-account-bot
+   ```
+
+3. Build the binary (ensure you have Go installed):
+
+   ```bash
+   go build -o gitea-register-account-bot
+   ```
+
+### Creating a Docker Image
+
+You may also create a Docker image using the provided Dockerfile:
+
+1. Build the Docker image:
+
+    ```bash
+    docker build -t gitea-register-account-bot:latest .
+    ```
+
+2. Run the Docker container:
+
+    ```bash
+    docker run -d --name gitea-register-account-bot -e DISCORD_TOKEN=your_token -e GITEA_TOKEN=your_token -e GITEA_URL=your_url gitea-register-account-bot:latest
+    ```
+
+## Using the Prebuilt Images and binaries
+
+We provide versioned as well as nightly builds through our CI/CD pipeline, where `:nightly` refers to an automatic build from
+the latest commit on the `main` branch. The latest release-version can be found with the `latest` Tag.
+
+### Using the Prebuilt Docker Image
+
+To use the prebuilt Docker image:
+
+1. Pull the `latest` image from the registry:
+
+    ```bash
+    docker pull git.beisel.it/beisel.org/gitea-register-account-bot:latest
+    ```
+
+2. Run the Docker container:
+
+    ```bash
+    docker run -d --name gitea-register-account-bot -e DISCORD_TOKEN=your_token -e GITEA_TOKEN=your_token -e GITEA_URL=your_url git.beisel.it/beisel.org/gitea-register-account-bot:latest
+    ```
+
+### Running Prebuilt Binaries
+
+Prebuilt binaries for Windows, Linux, and macOS are available in the releases section of this repository.
+
+To run the binary:
+
+1. Download the appropriate binary for your system.
+2. Make it executable (Linux/macOS):
+
+    ```bash
+    chmod +x gitea-register-account-bot-nightly-[linux-amd64,darwin-amd64]
+    ```
+
+3. Run the binary:
+
+   ```bash
+   DISCORD_TOKEN=your_discord_token GITEA_TOKEN=your_gitea_token GITEA_URL=your_gitea_url ./gitea-register-account-bot-nightly-[linux-amd64,darwin-amd64]
+   ```
+
+For Windows, simply execute the .exe file after setting your environment variables.
+
+## Contributing
+
+Contributions to this project are welcome. Please ensure you follow the existing code style.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
+
+## Support
+
+For support, please open an issue in the repository, or hit me up on the Gitea discord @pacey.