Add Asterive to Markdown tools directory

_tools/asterive.md

@@ -0,0 +1,77 @@
+---
+title: Asterive
+category: "notes"
+description: "A browser-first Markdown notes app with visual and source editing, search, files, and exports."
+icon: asterive.png
+website: https://asterive.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
+  - 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: n
+  - id: definition-lists
+    available: y
+  - 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
+    notes: "Single tildes produce strikethrough instead of subscript."
+  - id: superscript
+    available: n
+  - id: auto-url-linking
+    available: y
+  - id: disabling-auto-url
+    available: y
+  - id: html
+    available: p
+    notes: "Only a sanitized subset is supported. Unsafe elements, attributes, styles, and URL protocols are removed or escaped; scripts and forms are not supported."
+see-also:
+  - name: Asterive Markdown guide
+    link: https://asterive.com/markdown-guide
+---
+
+[Asterive](https://asterive.com) is a browser-first note-taking application that keeps note content in Markdown. Writers can use visual formatting controls, edit the Markdown source directly, or work with source and preview side by side.
+
+Notes can be organized with folders and labels, searched alongside associated files, and exported through Markdown and other portable formats. Asterive is account-based rather than a live local-folder editor.
+
+{% include image.html file="/assets/images/tools/asterive.webp" alt="Asterive showing Markdown source and preview side by side" %}
+
+{% include tool-syntax-table.html %}