Documented and illustrated functions and use cases

Fixing issues:

• #11
• #24

Smaller dist-size

Using files in package.json to whitelist what goes into the NPM-package.

main, module and browser in package.json + documenting use of them

• Correct main, module and browser in package.json
• Showing how to use, import or require geo-search-helper + JsDelivr-versions and how the functions are available