ADOPTERS.md: New file

Signed-off-by: Colin Walters <walters@verbum.org>

ADOPTERS.md

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+
+> **Note**
+> Do you want to add yourself to this list? Simply fork the repository and open a PR with the required change.
+> We have a short description of the adopter types at the bottom of this page. Each type is in alphabetical order. 
+
+# bootc Adopters (direct)
+
+| Type | Name | Since | Website | Use-Case |
+|:-|:-|:-|:-|:-|
+Vendor | Red Hat | 2024 | https://redhat.com | Image Based Linux 
+End-User | HeliumOS | 2024 | https://www.heliumos.org/ | An atomic desktop operating system for your devices.
+
+# bootc Adopters (indirect, via ostree)
+
+Bootc is a relatively new project, but much of the underlying technology and goals is *not* new.
+The underlying ostree project is over 13 years old (as of 2024). This project also relates
+to [rpm-ostree](https://github.com/coreos/rpm-ostree/) which has existed a really long time.
+
+Not every one of these projects uses bootc directly today, but a toplevel goal of bootc
+is to be the successor to ostree, and it is our aim to seamlessly carry forward these users.
+
+| Type | Name | Since | Website | Use-Case |
+|:-|:-|:-|:-|:-|
+| Vendor | Endless | 2014 | [link](https://www.endlessos.org/os) | A Completely Free, User-Friendly Operating System Packed with Educational Tools, Games, and More.
+| Vendor | Apertis | 2020 | [link](https://apertis.org) | Collaborative OS platform for products
+| Vendor | UBlue | 2023 | [link](https://universal-blue.org/) | The reliability of a Chromebook, but with the flexibility and power of a traditional Linux desktop. 
+| Vendor | Fedora Project | 2021 | [link](https://fedoraproject.org/atomic-desktops/) | An atomic desktop operating system aimed at good support for container-focused workflows.
+| Vendor | Red Hat | 2015 | [link](https://redhat.com) | Image Based Linux
+
+### Adopter Types
+
+**End-user**: The organization runs bootc in production in some way.
+
+**Integration**: The organization has a product that integrates with bootc, but does not contain bootc.
+
+**Vendor**: The organization packages bootc in their product and sells it as part of their product.
+