message: add api usage instructions to readme
diff: @@ -39,3 +39,21 @@ within `js-example/` run `npm run build`
  ### Running
  open `js-example/index.html` in any browser
  +
  +Using the Library in your Project
  +---------------------------------
  +
  +### Install locally:
  +in the root of this repo: `npm link`
  +in the root of your project: `npm link rust-cardano-crypto`
  +
  +### Install via NPM:
  +in the root of your project: `npm install rust-cardano-crypto`
  +
  +### Importing the API:
  +```js
  +// Import like this:
  +import CardanoCrypto from 'rust-cardano-crypto'
  +// Or access as global in browsers:
  +CardanoCrypto.PaperWallet.scramble(iv, password, input)
  +```
  