Add Angstrom unit (#1042)

* Add Angstrom unit

Author: JasLieb

Common/UnitDefinitions/Length.json

@@ -398,6 +398,20 @@
           "Abbreviations": [ "ch" ]
         }
       ]
+    },
+    {
+      "SingularName": "Angstrom",
+      "PluralName": "Angstroms",
+      "FromUnitToBaseFunc": "{x} * 1e-10",
+      "FromBaseToUnitFunc": "{x} / 1e-10",
+      "XmlDocSummary": "Angstrom is a metric unit of length equal to 1e-10 meter",
+      "XmlDocRemarks": "https://en.wikipedia.org/wiki/Angstrom",
+      "Localization": [
+        {
+          "Culture": "en-US",
+          "Abbreviations": [ "Å", "A" ]
+        }
+      ]
     }
   ]
 }

UnitsNet.NanoFramework/GeneratedCode/Quantities/Length.g.cs

@@ -78,6 +78,8 @@ public class LengthTests : LengthTestsBase
 
         protected override double DecametersInOneMeter => 1e-1;
 
+        protected override double AngstromsInOneMeter => 1e10;
+
         [ Fact]
         public void AreaTimesLengthEqualsVolume()
         {