add CIL (.net assembly)

c/cil.il

@@ -0,0 +1,10 @@
+// ilasm cil.il
+.assembly HelloWorld {}
+.method public static void Main() cil managed
+{
+     .entrypoint
+     .maxstack 1
+     ldstr "Hello World"
+     call void [mscorlib]System.Console::WriteLine(string)
+     ret
+}