docs: add known users section

add Ignition users

Signed-off-by: Mathieu Tortuyaux <mtortuyaux@microsoft.com>

README.md

@@ -1,11 +1,19 @@
 # Ignition
 
-Ignition is the utility used by Fedora CoreOS and RHEL CoreOS to manipulate disks during the initramfs. This includes partitioning disks, formatting partitions, writing files (regular files, systemd units, etc.), and configuring users. On first boot, Ignition reads its configuration from a source of truth (remote URL, network metadata service, hypervisor bridge, etc.) and applies the configuration.
+Ignition is a utility created to manipulate disks during the initramfs. This includes partitioning disks, formatting partitions, writing files (regular files, systemd units, etc.), and configuring users. On first boot, Ignition reads its configuration from a source of truth (remote URL, network metadata service, hypervisor bridge, etc.) and applies the configuration.
 
 ## Usage
 
 Odds are good that you don't want to invoke Ignition directly. In fact, it isn't even present in the root filesystem. Take a look at the [Getting Started Guide][getting started] for details on providing Ignition with a runtime configuration.
 
+## Known users
+
+- Fedora CoreOS
+- Red Hat Enterprise Linux CoreOS
+- Flatcar
+- openSUSE MicroOS
+- SUSE Linux Enterprise Micro
+
 ## Contact
 
 - Mailing list: [coreos@lists.fedoraproject.org](https://lists.fedoraproject.org/archives/list/coreos@lists.fedoraproject.org/)

docs/index.md

@@ -4,12 +4,20 @@ nav_order: 1
 
 # Ignition
 
-Ignition is the utility used by Fedora CoreOS and RHEL CoreOS to manipulate disks during the initramfs. This includes partitioning disks, formatting partitions, writing files (regular files, systemd units, etc.), and configuring users. On first boot, Ignition reads its configuration from a source of truth (remote URL, network metadata service, hypervisor bridge, etc.) and applies the configuration.
+Ignition is a utility created to manipulate disks during the initramfs. This includes partitioning disks, formatting partitions, writing files (regular files, systemd units, etc.), and configuring users. On first boot, Ignition reads its configuration from a source of truth (remote URL, network metadata service, hypervisor bridge, etc.) and applies the configuration.
 
 ## Usage
 
 Odds are good that you don't want to invoke Ignition directly. In fact, it isn't even present in the root filesystem. Take a look at the [Getting Started Guide][getting started] for details on providing Ignition with a runtime configuration.
 
+## Known users
+
+- Fedora CoreOS
+- Red Hat Enterprise Linux CoreOS
+- Flatcar
+- openSUSE MicroOS
+- SUSE Linux Enterprise Micro
+
 ## Contact
 
 - Mailing list: [coreos@lists.fedoraproject.org](https://lists.fedoraproject.org/archives/list/coreos@lists.fedoraproject.org/)