Implement and document Arduino software

documentation/Makefile

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+# Copyright (c):
+#
+# Philipp Matthias Schäfer (philipp.matthias.schaefer@posteo.de), 2020
+#
+# This file is part of the KrautStatus' Arduino code.
+#
+# The Clean CommonMark library is free software: you can redistribute it and/or
+# modify it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# The Clean CommonMark library is distributed in the hope that it will be
+# useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero
+# General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License along
+# with the Clean CommonMark library. If not, see
+# <https://www.gnu.org/licenses/>.
+
+.PHONY: all clean
+
+all: arduino.png
+
+clean:
+	rm --recursive build
+
+arduino.png: arduino.tex build
+	pdflatex -output-directory build arduino
+	convert -density 300 build/arduino.pdf -trim -colorspace RGB arduino.png
+
+build:
+	mkdir --parents build