Add MF-2: Markdown features

MF-2%3A Markdown features.-.md

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+Markdown is a lightweight markup language that allows you to format text using a simple, human-readable syntax. The main features are divided into two categories: **Basic Syntax** (universally supported) and **Extended Syntax** (may vary between applications).
+
+### Basic Syntax
+
+These features are part of the original Markdown specification and are supported by virtually all Markdown processors.
+
+* **Headings**: Use one to six number signs (`#`) at the beginning of a line. The number of hashtags corresponds to the heading level.
+* **Paragraphs and Line Breaks**: Paragraphs are created by one or more blank lines. A line break is created by adding two spaces at the end of a line.
+* **Emphasis**:
+    * **Bold**: Enclose text in double asterisks (`**bold**`) or double underscores (`__bold__`).
+    * **Italic**: Enclose text in single asterisks (`*italic*`) or single underscores (`_italic_`).
+* **Lists**:
+    * **Unordered Lists**: Use asterisks (`*`), hyphens (`-`), or plus signs (`+`) followed by a space.
+    * **Ordered Lists**: Use numbers followed by a period (`1.`, `2.`, `3.`) and a space.
+* **Links**: Use square brackets for the link text and parentheses for the URL, like so: `[text](url)`.
+* **Images**: Similar to links, but with an exclamation mark at the beginning: `![alt text](url)`.
+* **Blockquotes**: Use a right angle bracket (`>`) at the beginning of a line to quote text.
+* **Code**:
+    * **Inline Code**: Enclose code within single backticks (` `code` `).
+    * **Code Blocks**: Indent a block of code by four spaces or use triple backticks on separate lines (fenced code blocks).
+
+***
+
+### Extended Syntax
+
+These features were added to Markdown by various communities and are not part of the original specification. They are widely used, particularly in platforms like GitHub Flavored Markdown (GFM).
+
+* **Tables**: Use hyphens (`-`) and vertical bars (`|`) to create columns and rows.
+* **Task Lists**: Create an unordered list and add `[ ]` for an unchecked box or `[x]` for a checked box.
+* **Strikethrough**: Enclose text in double tildes (`~~strikethrough~~`).
+* **Fenced Code Blocks**: Use triple backticks (```) to enclose a block of code, often with a language identifier for syntax highlighting.
+* **Footnotes**: Use a number in brackets with a caret (`[^1]`) for a footnote, then define it elsewhere in the document.