feat: add support for markdownfmt (nvim-lua#511)

Co-authored-by: Christoffer Pettersson <[email protected]>

Author: 2 people

README.md

@@ -273,6 +273,7 @@ You can view this list in vim with `:help conform-formatters`
 - [llf](https://repo.or.cz/llf.git) - A LaTeX reformatter / beautifier.
 - [lua-format](https://github.com/Koihik/LuaFormatter) - Code formatter for Lua.
 - [markdown-toc](https://github.com/jonschlinkert/markdown-toc) - API and CLI for generating a markdown TOC (table of contents) for a README or any markdown files.
+- [markdownfmt](https://github.com/shurcooL/markdownfmt) - Like gofmt, but for Markdown.
 - [markdownlint](https://github.com/DavidAnson/markdownlint) - A Node.js style checker and lint tool for Markdown/CommonMark files.
 - [markdownlint-cli2](https://github.com/DavidAnson/markdownlint-cli2) - A fast, flexible, configuration-based command-line interface for linting Markdown/CommonMark files with the markdownlint library.
 - [mdformat](https://github.com/executablebooks/mdformat) - An opinionated Markdown formatter.

doc/conform.txt

@@ -378,6 +378,7 @@ FORMATTERS                                                    *conform-formatter
 `lua-format` - Code formatter for Lua.
 `markdown-toc` - API and CLI for generating a markdown TOC (table of contents)
                for a README or any markdown files.
+`markdownfmt` - Like gofmt, but for Markdown.
 `markdownlint` - A Node.js style checker and lint tool for Markdown/CommonMark
                files.
 `markdownlint-cli2` - A fast, flexible, configuration-based command-line

lua/conform/formatters/markdownfmt.lua

@@ -0,0 +1,8 @@
+---@type conform.FileFormatterConfig
+return {
+  meta = {
+    url = "https://github.com/shurcooL/markdownfmt",
+    description = "Like gofmt, but for Markdown.",
+  },
+  command = "markdownfmt",
+}