Improve formatting of Agave Readme

[Roshanjossey]

Description

Update the formatting to use Markdown format to display correctly on GitHub

Requirements / Checklist

• Read the Contributing Guidelines
• Read or at least glanced at the FAQ
• Read or at least glanced at the Wiki
• Scripts execute without error (if necessary):
  • If any of the scripts were modified they have been tested and execute without error, e.g.:
    • ./font-patcher Inconsolata.otf --fontawesome --octicons --pomicons
    • ./gotta-patch-em-all-font-patcher\!.sh Hermit
      I figured this step wasn't necessary for this change
• Extended the README and documentation if necessary, e.g. You added a new font please update the table

What does this Pull Request (PR) do?

Improves the formatting of documentation with appropriate format

How should this be manually tested?

Check the Readme file on GitHub

[ryanoasis]

Thanks, good improvement!

There is a potential issue in that these changes will be eventually be overwritten due to how the patched fonts readmes are generated.

See my comment here for more details: #381 (comment)