add missing xml heared to slnx file

IOBYTE · IOBYTE · commit cc080667bb01 · 2026-03-27T17:57:56.000-04:00
diff --git a/test/cli/helloworld/helloworld.slnx b/test/cli/helloworld/helloworld.slnx
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <Solution>
   <Configurations>
     <Platform Name="x64" />
