Add README.md to package-managers

package-managers/README.md

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+Package managers
+================
+
+Each Qubes VM should notify Qubes updater in dom0 of new updates
+available for the particular template or standalone VM.
+The is the configuration and hooks for various package managers to
+interact with Qubes updater. Moreover Qubes OS dom0 updates are
+downloaded by a Qubes VM, rather directly in dom0 which doesn't have
+networking configured at all.
+
+dom0 updates download
+---------------------
+
+`qubes-download-dom0-updates.sh` handles downloading packages for dom0
+in VM. It needs to be installed in VM which will handle dom0 updates
+download only.
+
+Apt
+---
+
+The configuration includes:
+
+1. Hook to notify dom0.
+2. Disabling unattended upgrades (Qubes updater).
+3. List of repos with Qubes packages for VM.