made the pack completely portable and wrote relevent bat files to go with it

gitportable/usr/share/vim/vim91/compiler/cs.vim

@@ -0,0 +1,23 @@
+" Vim compiler file
+" Compiler:               Microsoft Visual Studio C#
+" Maintainer:             Yichao Zhou (broken.zhou@gmail.com)
+" Previous Maintainer:    Joseph H. Yao (hyao@sina.com)
+" Last Change:            Jul 22, 2019
+"                         2024 Apr 03 by The Vim Project (removed :CompilerSet definition)
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "cs"
+let s:keepcpo= &cpo
+set cpo&vim
+
+CompilerSet errorformat&
+CompilerSet errorformat+=%f(%l\\,%v):\ %t%*[^:]:\ %m,
+            \%trror%*[^:]:\ %m,
+            \%tarning%*[^:]:\ %m
+
+CompilerSet makeprg=csc\ %:S
+
+let &cpo = s:keepcpo
+unlet s:keepcpo