Update requirements and makefile to build crawler companion software

crawler_software/arduino/crawler_slave/Makefile

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+# A makefile for building the robot's slave software
+# Uses arduino-cli
+#
+# Kitsune Scientific 2021
+
+# What board to build for and its core
+CORE     ?= arduino:avr
+FQBN     ?= arduino:avr:nano
+
+# What port to build on
+ifndef SERIAL_DEV
+  ifneq (,$(wildcard /dev/ttyUSB0))
+    SERIAL_DEV = /dev/ttyUSB0
+  else ifneq (,$(wildcard /dev/ttyACM0))
+    SERIAL_DEV = /dev/ttyACM0
+  else
+    SERIAL_DEV = unknown
+  endif
+endif
+
+all: requirements build upload
+
+build: crawler_slave.ino
+	arduino-cli core install $(CORE)
+
+	arduino-cli compile -b $(FQBN) crawler_slave
+
+upload:
+	echo "Would install to $(SERIAL_DEV)"
+
+requirements:
+	@if [ -e requirements.txt ]; \
+	then while read -r i ; do echo ; \
+		echo "---> Installing " '"'$$i'"' ; \
+		arduino-cli lib install "$$i" ; \
+	done < requirements.txt ; \
+	else echo "---> MISSING requirements.txt file"; \
+	fi

crawler_software/arduino/crawler_slave/requirements.txt

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+Servo