Add new sensors samples

doc/thing/samples/sensor-samples/dht.rst

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+dht
+===
+
+Overview
+--------
+
+The dht example reads ambient temperature and relative humidity measured by a
+DHT11 or DHT22 sensor. The purpose of this sample is to show how to use a
+sensor that is already covered by Zephyr sensors library.
+
+-------------------------------------------------------------------------------
+
+Requirements
+------------
+
+The demo assumes that sensor data pin is connected to the 1.15 pin.
+Make sure to use VDD OUT as the positive reference and GND as the negative
+reference.
+DHT11/22 datasheet recommends the use of a 10k resistor between VCC and data
+pin.
+
+-------------------------------------------------------------------------------
+
+.. include:: ../thing-sample-body.rst

doc/thing/samples/sensor-samples/gy-251-i2c-accelerometer-and-gyroscope.rst

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+gy-251-i2c-accelerometer-and-gyroscope
+======================================
+
+Overview
+--------
+
+The GY-251 example measures acceleration and angular velocity with 3 degrees
+of liberty each. The purpose of this sample is to show how to use a sensor
+that uses I2C communication protocol.
+
+-------------------------------------------------------------------------------
+
+Requirements
+------------
+
+The demo assumes that GY-251 SCL pin is connected to the 0.27 pin and SDA pin
+is connected to the 0.26 pin.
+Make sure to use VDD OUT (or 5V output if using DK board) as the positive
+reference and GND as the negative reference.
+
+-------------------------------------------------------------------------------
+
+.. include:: ../thing-sample-body.rst

doc/thing/samples/sensor-samples/pwm.rst

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+pwm
+===
+
+Overview
+--------
+
+The pwm example blinks a led using pwm. The purpose of this is sample is to
+show how to use pwm in Zephyr.
+
+-------------------------------------------------------------------------------
+
+Requirements
+------------
+
+The demo assumes that the positive terminal of a led is connected to the pin
+specified down below:
+
+- 0.13 pin (for KNoT DK and Dongle)
+
+KNoT DK already has an on board led connected to 0.13 pin.
+The negative terminal of the led should be connected to a 220 ohms resistor and
+the other resistor terminal should be connected to board GND.
+
+-------------------------------------------------------------------------------
+
+.. include:: ../thing-sample-body.rst