darts: add template

Author: ErikSchierboom

exercises/practice/darts/.meta/Generator.tpl

@@ -0,0 +1,12 @@
+using Xunit;
+
+public class DartsTests
+{
+    {{#test_cases}}
+    [Fact{{#unless @first}}(Skip = "Remove this Skip property to run this test"){{/unless}}]
+    public void {{test_method_name}}()
+    {
+        Assert.Equal({{expected}}, Darts.Score({{input.x}}, {{input.y}}));
+    }
+    {{/test_cases}}
+}

exercises/practice/darts/DartsTests.cs

@@ -1,6 +1,6 @@
 using Xunit;
 
-public class DartsTests
+public class DartssTests
 {
     [Fact]
     public void Missed_target()