docs: add installation section to homepage

docs/index.md

@@ -4,6 +4,15 @@ k3d is a lightweight wrapper to run [k3s](https://github.com/rancher/k3s) (Ranch
 
 k3d makes it very easy to create single- and multi-node [k3s](https://github.com/rancher/k3s) clusters in docker, e.g. for local development on Kubernetes.
 
+## Installation
+
+- Install via brew (homebrew/linuxbrew): `brew install k3d`
+- Install via script:
+  - wget: `wget -q -O - https://raw.githubusercontent.com/rancher/k3d/master/install.sh | bash`
+  - curl: `curl -s https://raw.githubusercontent.com/rancher/k3d/master/install.sh | bash`
+- Grab a release from the [release tab](https://github.com/rancher/k3d/releases) and install it yourself.
+- Get via go: `go install github.com/rancher/k3d` (**Note**: this will give you unreleased/bleeding-edge changes)
+
 ## Quick Start
 
 Create a cluster named `mycluster` with just a single master node:

thoughts.md

@@ -108,7 +108,7 @@
   - list                          -> dropped, implemented as `k3d get clusters`
   - get-kubeconfig                -> `k3d get kubeconfig CLUSTERNAME`
     - --name                      -> dropped, implemented as arg
-    - --all                       -> planned
+    - --all                       -> implemented
     - --overwrite                 -> implemented
   - import-images                 -> `k3d load image [--cluster CLUSTERNAME] [--keep] IMAGES`
     - --name                      -> implemented as `--cluster`