Updated 1. Introduction (markdown)

1.-Introduction.md

@@ -77,6 +77,17 @@ Yup, you guessed it, **we sell complete components kits**. See [[Step 2 of Appen
 
 No surprise, **we sell kits of these**. See [[Appendix D: Hardware]] for how to buy them from us (or how to get them yourself, if you want.)
 
+## Optional Step: Get the tools and components to program the microcontroller
+**This step is only necessary if you're making your own PCBs. If you bought PCBs from us, you can skip this step.** Otherwise, you'll need:
+
+- The Arduino IDE
+- A base PCB with all components soldered
+- An Arduino Nano
+- A USB mini-B to USB A cable
+- Hookup wire
+- A 10uF capacitor
+- A breadboard
+
 ## Step 6: A note about sourcing parts
 This guide will assume that you've gotten your components from us. If you've sourced your own, some parts of this guide may not make sense. You'll need to adapt the guide to suit your own components.