Add discord invite link to README

README.md

@@ -4,6 +4,8 @@ SmartKnob is an open-source input device with software-configurable endstops and
 A brushless gimbal motor is paired with a magnetic encoder to provide closed-loop torque feedback control, making it
 possible to dynamically create and adjust the feel of detents and endstops.
 
+Join the [Discord community](https://discord.gg/5jyhjcbTnR) to discuss the project with others, show off your build, or help answer each others' questions!
+
 [![Build Status](https://github.com/scottbez1/smartknob/actions/workflows/electronics.yml/badge.svg?branch=master)](https://github.com/scottbez1/smartknob/actions/workflows/electronics.yml)
 [![Build Status](https://github.com/scottbez1/smartknob/actions/workflows/pio.yml/badge.svg?branch=master)](https://github.com/scottbez1/smartknob/actions/workflows/pio.yml)