update rke2 readme (#54)

* update rke2 readme

* fixes

README.md

@@ -2,11 +2,44 @@
 
 We're starting to experiment with our next-generation Kuberenets distribution. This is currently an alpha project that will evolve a lot. Stay tuned.
 
-## Installation
+## What is this?
+
+RKE2 is a fully compliant Kubernetes distribution, with the following changes:
+
+- Packaged as a single binary.
+- Kubelet running as an embedded process in the agent and server.
+- Master components running as static pods.
+- All components images are compiled using Goboring library.
+- The following addons are installed as helm charts:
+  - CoreDNS
+  - Kube-proxy
+  - Canal
+  - Nginx Ingress Controller
+  - Metrics Server
+
+## Quick Start
+
+The `install.sh` script provides a convenient way for installing rke2 server and agent, to install rke2 service:
+
+```sh
+INSTALL_RKE2_VERSION=v0.0.1-alpha.4 ./install.sh
+```
+
+A kubeconfig is written to `/etc/rancher/rke2/rke2.yaml`, the install script will install rke2 and additional binaries such as `kubectl`, `ctr`, `rke2-uninstall.sh`.
+
+To start using the rke2 cluster:
+
+```sh
+export KUBECONFIG=/etc/rancher/rke2/rke2.yaml
+kubectl get nodes
+```
+
+`RKE2_TOKEN` is created at `/var/lib/rancher/rke2/server/node-token` on your server. To install on worker nodes we should pass `RKE2_URL` along with `RKE2_TOKEN` or `RKE2_CLUSTER_SECRET` environment variables, for example:
 
 ```sh
-sudo INSTALL_RKE2_VERSION=v0.0.1-alpha.4 ./install.sh
+RKE2_URL=https://myserver:6443 RKE2_TOKEN=XXX ./install.sh
 ```
 
-Additional flags available in the installation file itself.
+## Automated deployment
 
+We provide a simple automated way to install RKE2 on AWS via terraform scripts, this method requires terraform to be installed and access to AWS cloud, to get started please checkout the [rke2-build](https://github.com/rancher/rke2-build) repo.