📝 Update documentation

TODO.md

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+# Tests
+
+There aren't any which. At least basic unit tests would be good.
+
+# Documentation
+
+There's a README, but it should be expanded.
+
+# Error handling.
+
+There's very litle and this is a complex process involving talking to other systems over the net.
+
+# Convert to Ansible
+
+Maybe this should all have been an ansible role.  Maybe that will happen yet.
+
+# Ideas for specific scripts:
+
+## create_aio_vm
+
+Quite a few compromises to do with the versions of virt_install / libvirt available to me.