Add markdown test document covering common syntax features

test/MARKDOWN.md

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+# Test Markdown Document
+
+This document exercises a variety of Markdown features for testing purposes.
+
+## Inline Formatting
+
+This is **bold**, this is *italic*, and this is ***bold italic***.
+Here is `inline code` and ~~strikethrough~~ text.
+
+## Links and Images
+
+- [Example Link](https://example.com)
+- [Link with title](https://example.com "Example Title")
+- ![Alt text for image](https://via.placeholder.com/150)
+
+## Lists
+
+### Unordered
+
+- Item one
+- Item two
+  - Nested item A
+  - Nested item B
+    - Deep nested
+- Item three
+
+### Ordered
+
+1. First
+2. Second
+3. Third
+   1. Sub-item
+   2. Sub-item
+
+### Task List
+
+- [x] Completed task
+- [ ] Incomplete task
+- [ ] Another incomplete task
+
+## Blockquotes
+
+> This is a blockquote.
+>
+> > This is a nested blockquote.
+
+## Code Blocks
+
+Inline: `console.log("hello")`
+
+Fenced with language:
+
+```typescript
+function greet(name: string): string {
+  return `Hello, ${name}!`;
+}
+```
+
+Fenced without language:
+
+```
+plain code block
+no syntax highlighting
+```
+
+Indented code block:
+
+    four spaces
+    makes a code block
+
+## Tables
+
+| Left | Center | Right |
+|:-----|:------:|------:|
+| A1   |   B1   |    C1 |
+| A2   |   B2   |    C2 |
+| A3   |   B3   |    C3 |
+
+## Horizontal Rules
+
+---
+
+***
+
+___
+
+## HTML (inline)
+
+<details>
+<summary>Click to expand</summary>
+
+Hidden content inside a details block.
+
+</details>
+
+## Escapes and Special Characters
+
+\*not italic\* and \`not code\`
+
+Ampersand: &amp; | Less than: &lt; | Greater than: &gt;
+
+## Footnotes
+
+Here is a sentence with a footnote[^1].
+
+[^1]: This is the footnote content.
+
+## Heading Levels
+
+### H3
+
+#### H4
+
+##### H5
+
+###### H6