chore: missing file

Author: benoitf

api/extensions/redhat/redhat-authentication/preview/README.md

@@ -0,0 +1,38 @@
+
+# Red Hat Account extension
+
+This extension plugs into Podman Desktop an authentication provider that allows login to Red Hat SSO
+
+# Run and build
+
+
+
+To rebuild podman-desktop and OpenShift Local extension run:
+
+```shell
+  yarn build
+```
+
+To execute this extension into Podman Desktop, uses one of these commands:
+
+```shell
+  podman-desktop --extension-folder this_folder
+```
+
+if using the released bits from Podman Desktop
+
+or 
+
+```shell
+  yarn watch --extension-folder this_folder
+```
+
+from the Podman Desktop source folder if using the develpment version from Podman Desktop
+
+# Nightly build installation
+
+use `ghcr.io/redhat-developer/podman-desktop-redhat-account-ext:latest` on Settings/Extension page using 'Install a new extension from OCI Image' form (see screenshot below).
+
+
+
+![image](https://user-images.githubusercontent.com/620330/232674528-9d07e38d-618c-4d69-a01a-309033b7b3f0.png)