include file loader method of extracting CSS as separate file in README.md

[jcoyle37]

This PR contains a:

• [ ] bugfix
• [ ] new feature
• [ ] code refactor
• [ ] test update
• [ ] typo fix
• [ ] metadata update

Motivation / Use-Case

Providing additional example which, in my case, didn't require including any additional packages. Borrowed from https://stackoverflow.com/a/60029923/2969615, appeared to be a widely-used solution.

Breaking Changes

Only updating documentation. No breaking changes

Additional Info

None

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: jcoyle37 / name: Joe Coyle (0835b7a0710d3000eca9126006ec1178b72b29c8)

[codecov[bot]]

Codecov Report

Merging #1080 (d9e8acd) into master (78c0590) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1080   +/-   ##
=======================================
  Coverage   94.10%   94.10%           
=======================================
  Files           5        5           
  Lines         373      373           
  Branches      137      137           
=======================================
  Hits          351      351           
  Misses         19       19           
  Partials        3        3           

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[alexander-akait]

@jcoyle37 Can you run prettier on README (prettier "README.md" --write)

[alexander-akait]

Thank you