Standardized extensions on top of Markdown

MarkdownExtensions builds on top of Markdig. It offers and extension library and extension implementations on the Markdown syntax. It has the following features:

• include Javascript in resulting html
• include CSS in resulting html
• transform Markdown extension syntax into Markdown
• perform validation of the extension syntax
• optionally show syntax and model errors in generated html

MarkdownExtensions currently provides the following extensions:

• FolderFromDisk: specify a folder on disk, render the folder contents
• FolderList: Specify a folder structure with a nested list syntax and render as folder contents
• KeyboardKeys: Write a keyboard combination and see the keyboard keys nicely rendered
• MarkdownLinks: Link to a relative markdown file
• Snippet: Refer to a heading in a target markdown file and render the contents of the heading paragraph
• TableOfContent: Render a table of content on the left of the document in a <nav> html element
• XmlSnippet: Refer using an XPath expression of a target xml file and render the resulting xml in a codeblock

The following extensions are in development:

• Note: Start the paragraph with Note: and render a yellow box with paragraph contents
• PanZoomImage: Render an image within a box and having panning & zooming on that image
• MsSql: Refer to a target table and render the table (queried from the database) as html
• GitHistory: Render the history of a target git repo as a table
• Excel: Render the contents of an excel sheet as a table
• EnterpriseArchitect: Refer to object within an Enterprise Architect project and render it as html
• BpmnGraph: Render target bpmn file of graph
• GitGraph: Render target git repo history (using a custom syntax)

Go here to see examples.

MarkdownExtensions allows easy implementation of block extensions:

```extension-name
internal extension syntax
```

As well as easy implementation of inline extensions: [extension-name:internal extension syntax]