Added HDC1080 humidity sensor

library/Sensor_Humidity.dcm

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+EESchema-DOCLIB  Version 2.0
+#
+$CMP HDC1080
+D HDC1080 Low Power,High Accuracy Digital Humidity Sensor with Temperature Sensor
+K Temerature Humidity Sensor
+F http://www.ti.com/lit/ds/symlink/hdc1080.pdf
+$ENDCMP
+#
+#End Doc Library

library/Sensor_Humidity.lib

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+EESchema-LIBRARY Version 2.3
+#encoding utf-8
+#
+# HDC1080
+#
+DEF HDC1080 U 0 40 Y Y 1 F N
+F0 "U" -350 250 50 H V C CNN
+F1 "HDC1080" 200 250 50 H V C CNN
+F2 "Package_SON:Texas_PWSON-N6" 0 -350 50 H I C CNN
+F3 "" -200 250 50 H I C CNN
+DRAW
+S -400 200 400 -200 0 1 10 f
+X SDA 1 -500 100 100 R 50 50 1 1 C
+X GND 2 100 -300 100 U 50 50 1 1 W
+X DNC 3 -500 -100 100 R 50 50 1 1 N N
+X DNC 4 500 -100 100 L 50 50 1 1 N N
+X VCC 5 0 300 100 D 50 50 1 1 W N
+X SCL 6 500 100 100 L 50 50 1 1 C
+X GND 7 -100 -300 100 U 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+#End Library