README: Combine code snippets into one code snippet

[korydraughn]

The README can show one single code snippet that explains how to use the wrapper/client.

The lines in the README can become code comments.

With that in place, the developer looking to use this code can easily copy the example and give the wrapper a try.

For example:

import { Wrapper } from 'irods_client_http_typescript'
import { CollectionTypes } from "irods-http-api-wrapper"

// Create a url configuration object, containing info about
// the irods http api that's running on your local machine.
const urlComponents: URLComponentsType = {
    host: '<host>',
    port: '<port>',
    version: '<version>',
}

// Create a wrapper object, passing in the url components, as
// well as the username and password you want to log in with.
const api = new Wrapper(urlComponents, '<username>', '<password>')

// Authenticate the wrapper object within an asynchronous context.
(async () => {
    await api.authenticate()
})

// Declare type of res if working in typescript, otherwise just
// put 'let res'
let res: CollectionTypes.CollectionCreateResponse | null
let lpath = "/tempZone/home/user/newCollection"

(async () => {
    res = await api.collections.create({
        lpath: lpath
    })
})