Error in README.md

[kolaval]

Improve documentation

Link

Add a link to the page which needs improvement (if relevant)

Describe the problem

Not referencing instance

Describe the improvement

`var client = Client.Initialize("http://localhost:3000");

// Get All Messages
var response = await **Client**.Table<Message>().Get();`

should be var response = await **client**.Table<Message>().Get();

Additional context

Also the code does not work it returns an Api key error.

[acupofjose]

Thanks for the catch!