docs: add a description to the charmcraft reference page

Metadata

Project: charmcraft
Number: #2526
Type: pull request
State: open
Author: lengau
Labels: —
Created: 2025-12-11 19:24:05+00:00
Updated: 2025-12-11 19:24:36+00:00
Closed: —

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Issue body

--- - [ ] I've followed the [contribution guidelines](https://github.com/canonical/charmcraft/blob/main/CONTRIBUTING.md). - [ ] I've signed the [CLA](http://www.ubuntu.com/legal/contributors/). - [ ] I've successfully run `make lint && make test`. - [ ] I've added or updated any relevant documentation. - [ ] I've updated the relevant release notes.

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