New Images and Zephyr instructions update

Hey @jadonk, I have updated the Zephyr setup/installation instructions and added some new images (shown below), please take a look and let me know what you think. HTML and PDF versions of the README are also added for initial screening. In coming pull requests, a CSS file will be used for better viewing experience. In my opinion, the HTML file looks okay but, the PDF output requires a lot more work.

BCF with hand for size perspective	BCF renders in one image