Atoms
Atoms provides a simple way for developers to create small, reusable content elements that administrators can easily manage and place on a website. It's useful for adding simple text or other small content pieces where full content types like nodes would be too complex.
Atoms is meant to give developers an easy and quick way to add small pieces of content to a site that an administrator can then freely change as they see fit. Of course there are many options for content already like nodes and other entities to fill out a page, but these are usually overkill when just talking about a text in a custom form or similar.
This is what Atoms is for. Very small pieces of content in places where it's usually quite bothersome to embed any other type of content entity.
Features
Here, answer the following questions: What is the basic functionality? What unique features does enabling this project add? When and why would someone use this module? What use cases are there?
Post-Installation
After installation you can add .atoms.yml files to your modules and expose them for editing in the Atoms administration interface.
Additional Requirements
In order to use Media Library in Atoms you need the Media Library Form API Element module.