AsciiDoc Language Support in Zed

1st chunk of `docs/src/languages/asciidoc.md`

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# AsciiDoc

AsciiDoc language support in Zed is provided by the community-maintained [AsciiDoc extension](https://github.com/andreicek/zed-asciidoc).
Report issues to: [https://github.com/andreicek/zed-asciidoc/issues](https://github.com/andreicek/zed-asciidoc/issues)

- Tree-sitter: [cathaysia/tree-sitter-asciidoc](https://github.com/cathaysia/tree-sitter-asciidoc)

Title: AsciiDoc Language Support in Zed

Summary

Zed supports the AsciiDoc language through a community-maintained extension. Issues should be reported to the extension's GitHub repository. The extension uses the tree-sitter parser from cathaysia.