Adapt Readme to scope and purpose.

[fkuep]

Please confirm the following

• I agree to follow this project's code of conduct.
• I have checked the current issues for duplicates.
• I understand that ansible-rulebook is open source software provided for free and that I might not receive a timely response.

Feature type

Enhancement to Existing Feature

Feature Summary

Reflect in Project Readme, that ansble-eda wants to be for eda-server and not the reference implementation collection for ansible-rulebook.

Steps to reproduce

Create a pull request for a new event source.

Current results

Face a discussion on how this aligns with product goals.

Sugested feature result

Don´t create a pull request before You have checked eda-server´s milstones

Additional information

#196
#182 (comment)

[fkuep]

It should reduce pain, once poeple know it is too early to contribute event sources and that this project might have no use.
Perhaps contributing.md is a better place ?
People could be told to ask beforehand ?
https://github.com/ansible/event-driven-ansible/blob/main/CONTRIBUTING.md?plain=1#L5
The Term evaluation needs clarification: I would assume this means e.g.: a good test needs to be written.
From #182 I now understand, that a product team has meetings to decide, after the fact about the worthiness of the event source itsself not the contributed plugin quality.