Nixpkgs Development

1st chunk of `doc/development.md`

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# Development of Nixpkgs {#part-development}

This section shows you how Nixpkgs is being developed and how you can interact with the contributors and the latest updates.
If you are interested in contributing yourself, see [CONTRIBUTING.md](https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md).

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Title: Nixpkgs Development

Summary

This section provides information on how Nixpkgs is developed, how to interact with contributors, and how to stay updated. It also directs readers to the CONTRIBUTING.md file for contribution guidelines and mentions future plans to include information on testing pull requests and channel availability.