Enhance dev guide and move it to DEVELOPER.md file.
Main README.md is published together with the collection therefore it does not make much sense to read about development of this collection in Ansible Galaxy. Instead README.md should focus on collection itself.
Enhance dev guide and move it to DEVELOPER.md file. Main README.md is published together with the collection therefore it does not make much sense to read about development of this collection in Ansible Galaxy. Instead README.md should focus on collection itself.