Update instructions

Makefile

@@ -1,11 +1,14 @@
 # .DELETE_ON_ERROR:
 .SECONDARY:
-.PHONY: clean all
+.PHONY: clean all setup
 .DEFAULT: all
 
 container_cmd ?= docker
 container_args ?= -w /board -v $(shell pwd):/board --rm
 
+setup:
+	npm install
+
 # outputs from 
 output/pcbs/board.kicad_pcb output/pcbs/top_plate.kicad_pcb output/pcbs/bottom_plate.kicad_pcb &: samoklava.yaml
 	npm run gen

README.md

@@ -16,4 +16,15 @@ The interesting thing about this keyboard is that it's a declarative design ("sa
 * uses [kicad-automation-scripts](https://github.com/productize/kicad-automation-scripts) and [FreeRouting](https://github.com/freerouting/freerouting) to **automatically route the traces on the PCB**
 * uses [KiKit](https://github.com/yaqwsx/KiKit) to render PCB previews (see top of this file) and production-ready **Gerber files**
 
-See the [Makefile](Makefile) for more details.
+## How to
+If you would like to modify this:
+* fork it
+* change `samoklava.yaml` to your liking
+* push your changes; the build it GitHub Workflow will pick it up, autoroute and generate Gerbers, all in a zip file.
+  See https://github.com/soundmonster/samoklava/actions
+* or:
+  * make sure to have Docker CLI and NodeJS installed
+  * run `make setup clean all`
+  * check the `output` folder for KiCad PCBs and Gerbers
+
+See the [workflow](.github/workflows/build.yml) or the [Makefile](Makefile) for more details.