Implement and document Arduino software

source/arduino/sensor.h

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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/>.
+*/
+
+typedef enum {
+  CLOSED = 0,
+  OPEN = 1
+} door_state;
+
+void sensor_setup();
+
+door_state sensor_get_door_state();