Add a clear description of what is needed in the anytype network configuration and how to create it

[trenta3]

Have you read a contributing guide?

• [X] I have read CONTRIBUTING.md
• [X] I have searched the existing issues and didn't find any that were similar
• [X] I have considered creating a pull request with fixes instead of a bug report and want to proceed

Current Behavior

I'm currently unable to get the configuration for the locally deploy docker compose. I can't find how should I specify the configuration to enable the anytype application to connect to the backup node.

Expected Behavior

Clear documentation in the readme with a configuration example and the required file to give to anytype.

Steps To Reproduce

Install the current docker compose by typing make start

Environment

- OS: Fedora Linux
- Version: 38

Anything else?

No response