Add initial support for Markdown

[a-parris21]

Fixes #6

• Added code so the tool can read .md files
• Added parsing for # header1 and ## header2 syntax features.
• Fixed a minor issue on lines 45 and 54 in index.js, regarding a value comparison and variable names, as discussed on Slack/Discord.

Description

In your writeFile function, I have added a few lines which, when parsing the data, will check if the line begins with a '#' character. If the line starts with '# ' or '## ' followed by other text, a substring of that line will be made (truncating the first few characters which act as the identifier for the header syntax feature). And the substring will be used to add an <h1> or <h2> element to the html string.
This way, if a line begins with the appropriate syntax, then instead of generating a <p> element, an <h1> or <h2> element will be generated instead.

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