Added Area unit and unit tests.

Author: MrMatthewLayton

OnixLabs.Playground/Program.cs

@@ -12,11 +12,16 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+using System;
+using OnixLabs.Units;
+
 namespace OnixLabs.Playground;
 
 internal static class Program
 {
     private static void Main()
     {
+        Area<double> area = Area<double>.FromSquareMeters(567);
+        Console.WriteLine($"{area:sqin0}");
     }
 }