ws2812: add support for the ESP32-C3 processor

This adds support to the WS2812 for the ESP32-C3 processor
which is a RISC-V processor from Espressif.

Signed-off-by: deadprogram <ron@hybridgroup.com>

examples/ws2812/others.go

@@ -1,4 +1,4 @@
-//go:build !digispark && !arduino && !arduino_uno
+//go:build !digispark && !arduino && !arduino_uno && !xiao_esp32c3
 
 package main
 

examples/ws2812/xiao-esp32c3.go

@@ -0,0 +1,11 @@
+//go:build xiao_esp32c3
+
+package main
+
+import "machine"
+
+func init() {
+	// Replace neo in the code below to match the pin
+	// that you are using if different.
+	neo = machine.D6
+}