Add /choice endpoint description to README.md

[tiagostutz]

Following this issue comment #16 (comment), document the endpoint to get the next choice in the README.md

[viveksahu26]

Hey @tiagostutz , is this work for first time user or new contributer. Then i would like to work on it..

[tiagostutz]

Hi @viveksahu26 !! Welcome to stop analyzing!
Sure, it will be really nice to have your contributions here. Just assigned the issue to you.

If you need any further assistance, please let me know!

[tiagostutz]

Justo to help, you could show this returning JSON as example:

{
    "completeness": "0.3",
    "choices": [
        {
            "id": "5f355a24ccb4180025ee98ab",
            "title": "Fashion Shirt",
            "subtitle": "Colored nice Shirt",
            "contentURL": "https://lorempixel.com/640/480/",
            "attributes": [
                {
                    "size": "S",
                    "color": "multiple"
                }
            ]
        },
        {
            "id": "5f358359ccb4180025ee98ad",
            "title": "Corporate Shirt",
            "subtitle": "Corporate long sleeve Shirt",
            "contentURL": "https://lorempixel.com/640/480/",
            "attributes": [
                {
                    "size": "S",
                    "color": "black"
                }
            ]
        }
    ]
}

[viveksahu26]

@tiagostutz , Do i need to add JSON file in readme file..

[tiagostutz]

Yes, but not as an attachment, you could add the content inline, just like I did it #29 (comment).