rail-fence-cipher: add generator

Author: ErikSchierboom

exercises/practice/rail-fence-cipher/.meta/Generator.tpl

@@ -0,0 +1,15 @@
+using Xunit;
+
+public class {{testClass}}
+{
+    {{for test in tests}}
+    [Fact{{if !for.first}}(Skip = "Remove this Skip property to run this test"){{end}}]
+    public void {{test.shortTestMethod}}()
+    {
+        var msg = {{test.input.msg | string.literal}};
+        var sut = new RailFenceCipher({{test.input.rails}});
+        var expected = {{test.expected | string.literal}};
+        Assert.Equal(expected, sut.{{test.testedMethod}}(msg));
+    }
+    {{end}}
+}