Update README

Author: James Munnelly

README.md

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+# cert-manager
+
+cert-manager is a Kubernetes addon to automate the management and issuance of
+certificates from an aribitrary issuing source.
+
+It is loosely based upon the work of [kube-lego](https://github.com/jetstack/kube-lego)
+and has borrowed some wisdome from other similar projects eg.
+[kube-cert-manager](https://github.com/PalmStoneGames/kube-cert-manager).
+
+## Current status
+
+This project is still heavily under development and is not ready for use
+**yet**. However, if you want to experiment, please do try running the current
+development build and reporting any issues you run into.
+
+## Future plans
+
+Soon, I'd like to see cert-manager expose it's own API server, to be used by
+the apiserver-aggregator. This will allow us to perform verification of
+resources as they are submitted, and consequently reject 'bad' manifests.
+
+## Deploying
+
+To deploy the latest development version, run:
+
+```
+$ kubectl create -f docs/cert-manager.yaml
+```
+
+There is an example Certificate resource in `docs/acme-cert.yaml`, however
+requesting certificates via Ingress is not currently supported - instead, you
+must point your domain at the service created for cert-manager manually. This
+will naturally change over the coming days and weeks!
+
+```
+$ kubectl create -f docs/acme-cert.yaml
+```