Add code for water leak detection

sodaq_one/water.ino

@@ -0,0 +1,26 @@
+#include <Arduino.h>
+
+void setupWater(int pin) {
+     pinMode(pin, INPUT);
+}
+
+boolean hasWater(int pin)
+{
+    if(digitalRead(pin) == LOW) {
+        return true;
+    } else {
+        return false;
+    }
+}
+
+String getWater(int pin)
+{
+    String tmp;
+
+    if(hasWater(pin)) {
+        tmp = "water=1";
+    } else {
+        tmp = "water=0";
+    }
+    return tmp;
+}