Add initial support for Markdown

[anshul137]

Issue-6

• Added the feature to read .md file types in the SSG
• Parse out all the bold data from the .md file and convert it to html5.
• Fixed some other issue as dissused on Discord/Slack such it was not reading the file properly.

Description

In the Issue-6 branch I have created the readBookFileMD function similar to your readBookFile function, which will read and extract all the bold letters. Used the Regx to parsed the data from the md file and pushed into the array. Thanks

[anshul137]

Added markdown feature

[a-parris21]

Approved.