Add POST example with JSON payload

[k8vance88]

I recently tried this guide and the asynchronous mp rest client guide. I was looking for an example how to stub out a Post with JSON payload. The examples do have POST, but they are odd because they do not post any data. Most POST apis will have payload.

[ankitagrawa]

• Updating the readme.

[gkwan-ibm]

hi @k8vance88,

For the asynchronous mp rest client guide, we will revise it with a better application. If the new application use POST api, we will make sure the api will post data .

Regarding this guide-microprofile-rest-client, the application does not have the POST api. Does this guide or other guide have this POST issue?

Thanks