Add imperial pint (#635)

Add imperial pint

Author: tmilnthorp

Common/UnitDefinitions/Volume.json

@@ -459,6 +459,21 @@
           "Abbreviations": [ "ac-ft", "acre-foot", "acre-feet" ]
         }
       ]
+    },
+    {
+      "SingularName": "ImperialPint",
+      "PluralName": "ImperialPints",
+      "BaseUnits": {
+        "L": "Decimeter"
+      },
+      "FromUnitToBaseFunc": "x * 5.6826125e-4",
+      "FromBaseToUnitFunc": "x / 5.6826125e-4",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "pt (imp.)", "UK pt", "pt", "p" ]
+        }
+      ]
     }
   ]
 }

UnitsNet.Tests/CustomCode/VolumeTests.cs

@@ -90,7 +90,9 @@ public class VolumeTests : VolumeTestsBase
 
         protected override double MegalitersInOneCubicMeter => 0.001;
 
-        [Fact]
+        protected override double ImperialPintsInOneCubicMeter => 1.7597539863927023e3;
+
+        [ Fact]
         public void VolumeDividedByAreaEqualsLength()
         {
             Length length = Volume.FromCubicMeters(15)/Area.FromSquareMeters(5);