docs(README): add example install instructions for dependencies

[w3apps]

When running the examples in the code an error is thrown that style-loader and css-loader are missing.

[jsf-clabot]

All committers have signed the CLA.

[codecov]

Codecov Report

Merging #517 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #517   +/-   ##
=======================================
  Coverage   97.43%   97.43%           
=======================================
  Files           6        6           
  Lines         117      117           
=======================================
  Hits          114      114           
  Misses          3        3

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[alexander-akait]

@w3apps why? you can you other loader for css instead standard

[w3apps]

I know you can use other loaders. However, my change is strictly where the example uses those specific loaders. See attached image.
I am just a normal user (without prior webpack experience) that was following the examples step by step, and doing so I got stuck for a while until I realised what the problem was.

[joshwiens]

If the examples specifically require loaders, we should add them as devDependencies to simplify the DX

[michael-ciniawsky]

@w3apps Thx