Create `create-template` in AsyncAPI organization

[jonaslagoni]

Reason/Context

Stumbled upon this and thought it would be perfect for the generator. We could offer a way to use the init function which will allow people to more quickly setup new templates.

By creating create-template in the AsyncAPI scope we can do the following example commands:

• npm init @asyncapi/template --react
• npm init @asyncapi/template --nunjucks
• npm init @asyncapi/template

Description

This will significantly speed up the process of creating new ones and make it more accessible for people. This is similar to what React have - https://github.com/facebook/create-react-app