Add Markdown Preview Editor to the tool directory

_tools/markdown-preview-editor.md

@@ -0,0 +1,76 @@
+---
+title: Markdown Preview Editor
+category: "online editor"
+description: "Markdown Preview Editor is an open-source online Markdown editor with a live preview pane."
+icon: markdown-preview-editor.png
+website: https://mdprevieweditor.com
+syntax:
+  - id: headings
+    available: y
+  - id: paragraphs
+    available: y
+  - id: line-breaks
+    available: y
+  - 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
+    notes: "Links in the preview aren't clickable by default. Turn on the Allow links option to follow them."
+  - 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: p
+    notes: "Automatically generated. There's no way to set custom heading IDs."
+  - id: definition-lists
+    available: n
+  - 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: y
+    notes: "HTML is sanitized, so scripts and some elements are removed."
+see-also:
+  - name: Markdown Preview Editor repository on GitHub
+    link: https://github.com/ovasendin/markdown_preview_editor
+---
+
+[Markdown Preview Editor](https://mdprevieweditor.com) is an open-source online Markdown editor. Like [Dillinger](/tools/dillinger/), it has two panes: the editor on the left and a live preview on the right, with synchronized scrolling. Everything runs in the web browser. Documents aren't uploaded to a server, and no account is required.
+
+Several documents can be open at once in tabs. You can drag files, folders and images into the window. Documents can be exported as HTML, as PDF (through the browser's print dialog) or as Markdown files. The application also renders math with KaTeX and diagrams with Mermaid. Because it's a set of static files, you can host your own copy on any web server.
+
+{% include tool-syntax-table.html %}