Add example for use about webpack-svgstore-plugin HOT 3 CLOSED

This would be greatly helpful! The documentation is sparse and with the change between 2.0 and now 3.0 it's hard to know what exactly needs to be done get the plugin working again. Better documentation an example would be helpful.

It would also be helpful to have es6 examples in the documentation as I'm sure more people are moving towards import's vs require

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@khmelevskii @eilinora can you look up to https://github.com/mrsum/webpack-svgstore-plugin/tree/develop/platform this folder.

I think this example is enough

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@khmelevskii @eilinora Made new README.md here
https://github.com/mrsum/webpack-svgstore-plugin/blob/feature/long-term-caching/README.md

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