add readme

README.md

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+# ansible-role-cloudinit-wait
+
+Ansible role to wait for a cloud-init bootstrapped host to initialize.
+
+Disable fact gathering before calling this role:
+
+```
+- name: Wait for servers to come up
+  hosts: ...
+  gather_facts: no
+  roles:
+    - 'cloudinit-wait'
+```