C#: Add some initial examples.

Author: michaelnebel

csharp/ql/test/utils/model-generator/Summaries.cs

@@ -0,0 +1,36 @@
+using System;
+
+namespace Summaries;
+
+public class BasicFlow
+{
+    public BasicFlow ReturnThis(object input)
+    {
+        return this;
+    }
+
+    public string ReturnParam0(string input0, object input1)
+    {
+        return input0;
+    }
+
+    public object ReturnParam1(string input0, object input1)
+    {
+        return input1;
+    }
+
+    public object ReturnParamMultiple(object input0, object input1)
+    {
+        return (System.DateTime.Now.DayOfWeek == System.DayOfWeek.Monday) ? input0 : input1;
+    }
+
+    public int ReturnArrayElement(int[] input)
+    {
+        return input[0];
+    }
+
+    public void AssignToArray(int data, int[] target)
+    {
+        target[0] = data;
+    }
+}