Add npm instructions to readme

[vikr01]

Since shards-ui is a package on npm, it's worth mentioning how to use it as a dependency instead of with html. Personally, I like bundling all my css with webpack so that it doesn't need to be depend on another site.

Additions to README:

• npm version badge
• npm downloads per month badge
• dependencies status badge
• devDependencies status badge
• Add npm package link to Getting Started
• Instructions for installing with npm
• Instructions for usage with webpack or another bundler

[vikr01]

@hisk done

[hisk]

@vikr01 Great! 👍Thanks Vik! 😊