Add MD Preview to the tools directory

_tools/mdpreview.md

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+---
+title: MD Preview
+category: documents
+description: "MD Preview is a Markdown viewer and editor for iPhone, iPad, and Mac."
+icon: mdpreview.png
+website: https://dilekeminoglu.github.io/mdpreview/
+syntax:
+  - id: headings
+    available: y
+  - id: paragraphs
+    available: y
+  - id: line-breaks
+    available: y
+    notes: "Both trailing whitespace and a trailing backslash (`\\`) are supported."
+  - 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: y
+  - id: heading-ids
+    available: y
+  - id: definition-lists
+    available: y
+  - id: strikethrough
+    available: y
+  - id: task-lists
+    available: y
+  - id: emoji-cp
+    available: y
+  - id: emoji-sc
+    available: y
+  - id: highlight
+    available: y
+  - id: subscript
+    available: y
+  - id: superscript
+    available: y
+  - id: auto-url-linking
+    available: y
+  - id: disabling-auto-url
+    available: y
+  - id: html
+    available: p
+    notes: "Common inline tags are rendered (`b`, `i`, `em`, `strong`, `mark`, `sub`, `sup`, `code`, `a`, `br`, `img`, `del`). HTML comments are stripped."
+see-also:
+  - name: MD Preview on the App Store
+    link: https://apps.apple.com/us/app/md-preview/id6790422676
+---
+
+[MD Preview](https://dilekeminoglu.github.io/mdpreview/) is a native Markdown
+viewer and editor for iPhone, iPad, and Mac. Open any Markdown file and it's
+rendered in one of three themes: light, dark, or a sepia "book" mode with
+serif typography designed for long reading sessions.
+
+The app includes a table of contents sidebar, in-document search,
+syntax-highlighted code blocks, PDF export, and a live split-screen editor.
+Documents are processed entirely on device, and the app works offline.