Fixes #18

[oliver-pham]

What changes I've made

I've added support for parsing Markdown to your SSG. Right now, it can only parse Markdown headings, italics, and bold text.

Why I made these changes

This pull request should resolve #18.

How I implemented it

I made use of regular expressions to capture Markdown syntax and its content. The content, which is extracted with capturing groups, can then be passed to corresponding HTML templates. See markdown object in /lib/parser/markdown.js. Other changes I've added:

• Documentation for supported file type and features
• A method to check if a file type is supported, isFileSupported
• A method to process Markdown content, treatMarkdownData
• A method to render content in HTML based on the file type, renderContent
• Refactored unnecessary code

[ycechungAI]

ya overall looks good, I probably need to test it after i merge.
Cause you are running mac and im running windows/linux
Thanks

[ycechungAI]

i have reviewed the changes