feat: add missing KF6 framework recipes

local/recipes/kde/kf6-syntaxhighlighting/source/autotests/input/csharp.cs

@@ -0,0 +1,38 @@
+// this is a single-line comment
+// NOTE ### FIXME TODO
+
+/* this is a
+   multi-line comment
+*/
+
+/* this is another
+ * multiline comment
+ * NOTE ### FIXME TODO
+ */
+
+/** this is another
+ * multiline comment
+ * NOTE ### FIXME TODO
+ */
+
+// simple assignment
+var i = 5;
+
+var j = // assignment missing, still should be nice highlighting
+var k   // assignment missing, still should be nice highlighting
+
+// test a string
+var s = "Hello World!";
+
+// arr is an array
+var arr = new[] { 0, 1, 2, 3, 4 };
+
+// expr is compiled as IEnumerable<Customer>
+// or perhaps IQueryable<Customer>
+var expr =
+    from c in customers
+    where c.City == "London"
+    select c;
+
+// compiled anonymous type
+var anon = new { Country = "Germany", Inhabitants = 80000000 };