Add solar radius and solar temperature units (#683)

* Added SolarRadius unit to Length quantity.
* Added SolarTemperature unit to Temperature quantity

Author: ebfortin

Common/UnitDefinitions/Length.json

@@ -337,6 +337,20 @@
           "Abbreviations": [ "ly" ]
         }
       ]
+    },
+    {
+      "SingularName": "SolarRadius",
+      "PluralName": "SolarRadiuses",
+      "FromUnitToBaseFunc": "x * 6.95510000E+08",
+      "FromBaseToUnitFunc": "x / 6.95510000E+08",
+      "XmlDocSummary": "Solar radius is a ratio unit to the radius of the solar system star, the sun.",
+      "XmlDocRemarks": "https://en.wikipedia.org/wiki/Stellar_classification",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "R⊙" ]
+        }
+      ]
     }
   ]
 }

Common/UnitDefinitions/Temperature.json

@@ -126,6 +126,18 @@
           "Abbreviations": [ "°Rø" ]
         }
       ]
+    },
+    {
+      "SingularName": "SolarTemperature",
+      "PluralName": "SolarTemperatures",
+      "FromUnitToBaseFunc": "x * 5778",
+      "FromBaseToUnitFunc": "x / 5778",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "T⊙" ]
+        }
+      ]
     }
   ]
 }

UnitsNet.Tests/CustomCode/LengthTests.cs

@@ -71,6 +71,8 @@ public class LengthTests : LengthTestsBase
 
         protected override double ParsecsInOneMeter => 3.2407790389471100000000000E-17;
 
+        protected override double SolarRadiusesInOneMeter => 1.43779384911791000E-09;
+
         [ Fact]
         public void AreaTimesLengthEqualsVolume()
         {

UnitsNet.Tests/CustomCode/TemperatureTests.cs

@@ -25,6 +25,8 @@ public class TemperatureTests : TemperatureTestsBase
 
         protected override double KelvinsInOneKelvin => 1;
 
+        protected override double SolarTemperaturesInOneKelvin => 1.73070266528210E-04;
+
         public static IEnumerable<object[]> DividedByTemperatureDeltaEqualsTemperatureData { get; } =
             new List<object[]>
             {
@@ -116,6 +118,8 @@ public void TemperatureMinusTemperatureDeltaEqualsTemperature(Temperature temper
                 new object[] { Temperature.FromDegreesFahrenheit(-10), TemperatureDelta.FromDegreesFahrenheit(20), Temperature.FromDegreesFahrenheit(10) }
             };
 
+
+
         [Theory]
         [MemberData(nameof(TemperaturePlusTemperatureDeltaEqualsTemperatureData))]
         public void TemperaturePlusTemperatureDeltaEqualsTemperature(Temperature temperature, TemperatureDelta delta, Temperature expected)