[registry-facade] Introduce a readme.md

Author: kylos101

components/registry-facade/README.md

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+# Introduction to registry-facade
+
+The container runtime consumes `registry-facade`.
+
+Registry-facade modifies images as they are downloaded. It consults with `ws-manager` and adds layers in a certain order:
+
+1. The base image for the workspace
+2. supervisor
+3. workspacekit
+4. A DockerUp image
+5. IDE
+6. Desktop IDE
+
+It also adds the `gp` cli to the workspace. Think of `registry-facade` as an image layer smuggler.