Add README

README.md

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+# Qubesdbus
+
+This package contains a qubes extension called `QubesDbusProxy` and Qubes D-Bus
+services. UI developer should use the D-Bus API to interact with
+`qubes-core-admin`.
+
+## Services
+
+* `org.qubes.DomainManager1` - equivalent to `qubes.Qubes` for managing domains.
+* `org.qubes.Labels1`   - Collection holding all the labels provided by the
+  system
+
+## Objects
+
+* `Domain` is managed by `DomainManager1` and represents a domain. Its D-Bus
+object path is `/org/qubes/DomainManager1/domains/QID`
+* `Label` a qubes label. Its D-Bus object path is `org/qubes/Labels1/labels/COLORNAME`