Merge pull request #1265 from lukemarsden/master

[WIP] kubeadm and add-on docs

docs/admin/addons.md

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+---
+---
+
+## Overview
+
+Add-ons extend the functionality of Kubernetes.
+
+This page lists some of the available add-ons and links to their respective installation instructions.
+
+## Networking and Network Policy
+
+* [Weave Net](https://github.com/weaveworks/weave-kube) provides networking and network policy, will carry on working on both sides of a network partition, and does not require an external database.
+* [Calico](https://github.com/projectcalico/calico-containers/tree/master/docs/cni/kubernetes/manifests/kubeadm) is a secure L3 networking and network policy provider.
+* [Canal](https://github.com/tigera/canal/tree/master/k8s-install/kubeadm) unites Flannel and Calico, providing networking and network policy.
+
+## Visualization & Control
+
+* [Weave Scope](https://www.weave.works/documentation/scope-latest-installing/#k8s) is a tool for graphically visualizing your containers, pods, services etc. Use it in conjunction with a [Weave Cloud account](https://cloud.weave.works/) or host the UI yourself.
+* [Dashboard](https://github.com/kubernetes/dashboard#kubernetes-dashboard) is a dashboard web interface for Kubernetes.
+
+## Legacy Add-ons
+
+There are several other add-ons documented in the deprecated [cluster/addons](https://github.com/kubernetes/kubernetes/tree/master/cluster/addons) directory.
+
+Well-maintained ones should be linked to here. PRs welcome!