Add uwu in C#

README.md

@@ -8,6 +8,7 @@ uwu in every programming language in the world
 - [AWK](uwu.awk)
 - [Bourne shell (sh)](uwu.sh)
 - [C](uwu.c)
+- [C#](uwu.cs)
 - [C++](uwu.cpp)
 - [D](uwu.d)
 - [Elixir](uwu.ex)

uwu.cs

@@ -0,0 +1,9 @@
+using System;
+
+class uwu
+{
+  static void Main(string[] args)
+  {
+    Console.WriteLine("uwu");
+  }
+}