project: document currently known packagers

Note that this entire document needs a modernization pass, both for
current best practices as well as something approximating
s/Docker/Moby/.

In the interest of making some forward progress, we'll make minimal
changes for now, however.

Signed-off-by: Bjorn Neergaard <bjorn.neergaard@docker.com>

project/PACKAGERS.md

@@ -1,7 +1,19 @@
-# Dear Packager,
+# For Users
+
+The Moby Project is widely packaged by many independent software distributors,
+generally under the name 'docker' or 'docker.io.'
+
+A non-exhuastive list of known software packagers and distributions includes:
+
+- [Docker Inc. - Docker CE](https://docs.docker.com/engine/)
+- [Mirantis - Mirantis Container Runtime](https://docs.mirantis.com/mcr/)
+- [Microsoft - CBL-Mariner Linux](https://microsoft.github.io/CBL-Mariner/docs/)
+- [AWS - Amazon Linux](https://aws.amazon.com/linux/)
+
+# For Packagers
 
 If you are looking to make Docker available on your favorite software
-distribution, this document is for you. It summarizes the requirements for
+distribution, the following is for you. It summarizes the requirements for
 building and running the Docker client and the Docker daemon.
 
 ## Package Name