chore: import upstream snapshot with attribution

tests/fixtures/sample.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+
+namespace GraphifyDemo
+{
+    public interface IProcessor
+    {
+        List<string> Process(List<string> items);
+    }
+
+    public class Processor
+    {
+    }
+
+    public class Result<T>
+    {
+    }
+
+    public class DataProcessor : Processor, IProcessor
+    {
+        private readonly HttpClient _client;
+
+        public Processor Owner { get; set; }
+
+        public List<Processor> Workers { get; set; }
+
+        public DataProcessor()
+        {
+            _client = new HttpClient();
+        }
+
+        public List<string> Process(List<string> items)
+        {
+            return Validate(items);
+        }
+
+        public Result<DataProcessor> Build(HttpClient client)
+        {
+            return null;
+        }
+
+        private List<string> Validate(List<string> items)
+        {
+            var result = new List<string>();
+            foreach (var item in items)
+            {
+                if (!string.IsNullOrEmpty(item))
+                    result.Add(item.Trim());
+            }
+            return result;
+        }
+    }
+}