Add notes on K3d from Jacob Christen

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Author: alexellis

_posts/2021-05-12-kim.md

@@ -42,7 +42,7 @@ We'll use [arkade 0.7.14](https://github.com/alexellis/arkade/releases/tag/0.7.1
 
 ## Quickstart
 
-You'll need a Virtual Machine (VM) since kim currently does not work with k3d out of the box.
+You'll need a Virtual Machine (VM) since kim currently does not work with [K3d](https://github.com/rancher/k3d) out of the box.
 
 All commands need to be run on your client, not on the VM. Do not log into the VM, it's unnecessary.
 
@@ -258,7 +258,7 @@ The kim project is still nascent, and likely to change and improve over time.
 
 These statements are true at time of writing and may change:
 
-* kim doesn't work "out of the box" with K3d and [requires additional configuration](https://twitter.com/dweomer/status/1392207985380757505?s=20)
+* kim doesn't work "out of the box" with [K3d](https://github.com/rancher/k3d) and [requires additional configuration](https://twitter.com/dweomer/status/1392207985380757505?s=20)
 * I haven't been able to confirm whether it works with Apple M1 yet. The new [Rancher Desktop tool](https://github.com/rancher-sandbox/rd) that ships with kim built-in does not work with Apple M1
 * The `--squash` flag is not yet available in kim
 * kim also doesn't work for multi-node setups because it was designed to only accelerate local development
@@ -280,3 +280,27 @@ You can watch [me](https://twitter.com/alexellisuk) and [Matt Farina](https://tw
 Join GitHub Sponsors for 25 USD / mo for access to discounts, offers, and updates on OpenFaaS going back to mid-2019. By taking this small step, you are enabling me to continue to work on OpenFaaS and the other tools we have spoken about today.
 
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+
+### Addendum
+
+[Jacob Christen](https://twitter.com/dweomer) from Rancher sent me these two commands on Twitter. I haven't tested them, so your mileage may vary. They should enable `kim` with k3d / Docker.
+
+For [K3d](https://github.com/rancher/k3d):
+
+```bash
+k3d cluster create \
+  --volume /var/lib/buildkit \
+  --volume /var/lib/rancher \
+  --volume /tmp
+```
+
+For K3s within Docker:
+
+```bash
+docker run -it --name k3s --privileged \
+--tmpfs /run \
+--tmpfs /tmp \
+--volume /var/lib/buildkit \
+--volume /var/lib/rancher \
+rancher/k3s:v1.20.5-k3s1 server --token=k3s
+```