add helix markdown language config

helix/languages.toml

@@ -0,0 +1,13 @@
+[[language]]
+# Copied from default language config
+name = "markdown"
+scope = "source.md"
+injection-regex = "md|markdown"
+file-types = ["md", "livemd", "markdown", "mdx", "mkd", "mkdn", "mdwn", "mdown", "markdn", "mdtxt", "mdtext", "workbook", { glob = "PULLREQ_EDITMSG" }]
+roots = [".marksman.toml"]
+language-servers = [ "marksman", "markdown-oxide" ]
+indent = { tab-width = 2, unit = "  " }
+block-comment-tokens = { start = "<!--", end = "-->" }
+# Formatting with Prettier
+auto-format = true
+formatter = { command = "prettier" , args = ["--parser=markdown", "--prose-wrap=always"] }