add readme and license

LICENSE.TXT

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+Copyright (c) 2021 Mats van Reenen
+
+ Permission is hereby granted, free of charge, to any person
+ obtaining a copy of this software and associated documentation
+ files (the "Software"), to deal in the Software without
+ restriction, including without limitation the rights to use,
+ copy, modify, merge, publish, distribute, sublicense, and/or sell
+ copies of the Software, and to permit persons to whom the
+ Software is furnished to do so, subject to the following
+ conditions:
+
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# Rotory Encoder for arduino
+
+Description comming soon.
+
+## Licence
+
+This software is licened under the MIT licence
+
+Copyright (c) 2021 Mats van Reenen
+
+## Pinout
+
+### Arduino Uno
+
+| pin | goes to             |
+|----:|---------------------|
+|   2 | light gate 0        |
+|   3 | light gate 1        |
+|  10 | home switch         |
+|  11 | analog out (filter) |
+
+The analog out is a PWM signal of 31 kHz it you add a low pass filter 1 kΩ en 1 nF.

rotoryEncoder.ino

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+/** Rotory Encoder
+ *
+ * @author: Mats van Reenen <mail@matsvanreenen.nl>
+ * @license: MIT
+ */
+
 #define SENS0_PIN 2
 #define SENS1_PIN 3
 #define ANALOGOUT_PIN 11