Add super-simple kick-off guide

[mesilov]

Description

1. hide some technical details from beginners
2. give examples from the simplest to the most complex. that is, get rid of all the useful load and come close to that very concept that you told me about - how much time passes between acquaintance and execution of the first request.

• add optional fields
• add tests for fabric
• webhook
• local application

Example

1. Basic example
2. Example with env-variables