add docs for ingress/service and overall docs layout (#1476)

* documentation

* add docs for ingress/service and overall docs layout

Author: M00nF1sh

deploy/ingress.yaml

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+<p>
+    <img src="assets/images/aws_load_balancer_icon.svg" alt="AWS LoadBalancer Logo" width="200" />
+</p>
+
+## AWS LoadBalancer Controller
+
+AWS LoadBalancer Controller is a controller to help manage Elastic Load Balancers for a Kubernetes cluster.
+
+  - It satisfies Kubernetes [Ingress resources](https://kubernetes.io/docs/concepts/services-networking/ingress/) by provisioning [Application Load Balancers](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/introduction.html).
+  - It satisfies Kubernetes [Service resources](https://kubernetes.io/docs/concepts/services-networking/service/) by provisioning
+[Network Load Balancers](https://docs.aws.amazon.com/elasticloadbalancing/latest/network/introduction.html).
+
+This project was formerly known as "AWS ALB Ingress Controller", we rebranded it to be "AWS LoadBalancer Controller".
+
+  - AWS ALB Ingress Controller was originated by [Ticketmaster](https://github.com/ticketmaster) and [CoreOS](https://github.com/coreos) as part of Ticketmaster's move to AWS and CoreOS Tectonic. Learn more about Ticketmaster's Kubernetes initiative from Justin Dean's video at [Tectonic Summit](https://www.youtube.com/watch?v=wqXVKneP0Hg).
+
+  - AWS ALB Ingress Controller was donated to Kubernetes SIG-AWS to allow AWS, CoreOS, Ticketmaster and other SIG-AWS contributors to officially maintain the project. SIG-AWS reached this consensus on June 1, 2018.
+
+
+## Security disclosures
+
+If you think you’ve found a potential security issue, please do not post it in the Issues.  Instead, please follow the instructions [here](https://aws.amazon.com/security/vulnerability-reporting/) or [email AWS security directly](mailto:[email protected]).
+
+## Documentation
+Checkout our [Live Docs](https://kubernetes-sigs.github.io/aws-alb-ingress-controller/)!

docs/README.md

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+TODO: describes the controller configurations, i.e. the controller flags

docs/assets/images/aws_load_balancer_icon.svg

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+TODO: describes how to install the controller.

docs/guide/controller/configurations.md

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+TODO: describes how to do subnet auto discovery.