added WQI

app/src/main/java/com/sf/stormwaterutilityandroid/WaterWay/WQI.java

@@ -0,0 +1,31 @@
+package com.sf.stormwaterutilityandroid.WaterWay;
+
+public class WQI {
+    private double CT_temperature_change = 0;
+    private double CT_turbidity = 0;
+    private double CT_pH = 0;
+    private double CT_nitrate = 0;
+    private double CT_total_phosphate = 0;
+    private double CT_dissolved_oxygen = 0;
+
+    WQI(double CT_temperature_change, double CT_turbidity, double CT_pH, double CT_nitrate, double CT_total_phosphate,
+        double CT_dissolved_oxygen) {
+        this.CT_temperature_change = CT_temperature_change;
+        this.CT_turbidity = CT_turbidity;
+        this.CT_pH = CT_pH;
+        this.CT_nitrate = CT_nitrate;
+        this.CT_total_phosphate = CT_total_phosphate;
+        this.CT_dissolved_oxygen = CT_dissolved_oxygen;
+    }
+
+    public double calculateWQI() {
+        double WQIScore = CT_temperature_change * 0.11 + CT_turbidity * 0.09 + CT_pH * 0.12 + CT_nitrate * 0.1 +
+                CT_total_phosphate * 0.11 + CT_dissolved_oxygen * 0.18;
+
+        return WQIScore;
+    }
+
+    public static double getWQI(double tempChange, double turbidity, double pH, double nitrate, double phosphate, double oxygen) {
+        return tempChange * 0.11 + turbidity * 0.09 + pH * 0.12 + nitrate * 0.1 + phosphate * 0.11 + oxygen * 0.18;
+    }
+}