Add MDTool to the tool directory

_tools/mdtool.md

@@ -0,0 +1,76 @@
+---
+title: MDTool
+category: "online editor"
+description: "MDTool is a free, client-side Markdown converter for PDF, Word, and HTML."
+icon: mdtool.png
+website: https://www.mdtool.dev
+syntax:
+  - id: headings
+    available: y
+  - id: paragraphs
+    available: y
+  - id: line-breaks
+    available: y
+    notes: "A single newline is rendered as a line break (GitHub comment style)."
+  - id: bold
+    available: y
+  - id: italic
+    available: y
+  - id: blockquotes
+    available: y
+  - id: ordered-lists
+    available: y
+  - id: unordered-lists
+    available: y
+  - id: code
+    available: y
+  - id: horizontal-rules
+    available: y
+  - id: links
+    available: y
+  - id: images
+    available: y
+  - id: tables
+    available: y
+  - id: fenced-code-blocks
+    available: y
+  - id: syntax-highlighting
+    available: y
+  - id: footnotes
+    available: n
+  - id: heading-ids
+    available: n
+  - id: definition-lists
+    available: n
+  - id: strikethrough
+    available: y
+  - id: task-lists
+    available: y
+  - id: emoji-cp
+    available: y
+  - id: emoji-sc
+    available: n
+  - id: highlight
+    available: n
+  - id: subscript
+    available: n
+  - id: superscript
+    available: n
+  - id: auto-url-linking
+    available: y
+  - id: disabling-auto-url
+    available: y
+  - id: html
+    available: p
+    notes: "HTML renders in the preview and HTML export. PDF and Word exports convert supported elements only."
+---
+
+[MDTool](https://www.mdtool.dev) is a free, browser-based Markdown converter. Conversion runs client-side: files aren't uploaded to a server and no account is required.
+
+MDTool converts Markdown to PDF (selectable vector text, four themes, A4 or Letter, rendered Mermaid diagrams), to Word `.docx` files that use Word's built-in Heading 1–6 styles (so the Navigation pane and automatic table of contents work), and to HTML. It also converts Word documents and HTML back to Markdown, and includes a visual Markdown table generator.
+
+{% include image.html file="/assets/images/tools/mdtool.png" alt="MDTool Markdown to Word converter" %}
+
+MDTool uses [marked](https://marked.js.org/) with GitHub Flavored Markdown enabled, [highlight.js](https://highlightjs.org/) for code, and [Mermaid](https://mermaid.js.org/) for diagrams.
+
+{% include tool-syntax-table.html %}