Initial data commit

Task/File-input-output/C-sharp/file-input-output-1.cs

@@ -0,0 +1,8 @@
+using System.IO;
+
+using (var reader = new StreamReader("input.txt"))
+using (var writer = new StreamWriter("output.txt"))
+{
+    var text = reader.ReadToEnd();
+    writer.Write(text);
+}

Task/File-input-output/C-sharp/file-input-output-2.cs

@@ -0,0 +1,4 @@
+using System.IO;
+
+var text = File.ReadAllText("input.txt");
+File.WriteAllText("output.txt", text);