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

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

@@ -0,0 +1,32 @@
+" Vim compiler file
+" Compiler:     Mono C# Compiler
+" Maintainer:   Jarek Sobiecki <harijari@go2.pl>
+" Contributors: Peter Collingbourne and Enno Nagel
+" Last Change:  2024 Mar 29
+"               2024 Apr 05 by The Vim Project (removed :CompilerSet definition)
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "mcs"
+
+let s:cpo_save = &cpo
+set cpo-=C
+
+CompilerSet makeprg=mcs
+CompilerSet errorformat=
+         \%D%.%#Project\ \"%f/%[%^/\"]%#\"%.%#,
+         \%X%.%#Done\ building\ project\ \"%f/%[%^/\"]%#\"%.%#,
+         \%-G%\\s%.%#,
+         \%E%f(%l):\ error\ CS%n:%m,
+         \%W%f(%l):\ warning\ CS%n:%m,
+         \%E%f(%l\\,%c):\ error\ CS%n:%m,
+         \%W%f(%l\\,%c):\ warning\ CS%n:%m,
+         \%E%>syntax\ error\\,%m,%Z%f(%l\\,%c):\ error\ CS%n:%m,
+         \%D%*\\a[%*\\d]:\ Entering\ directory\ `%f',
+         \%X%*\\a[%*\\d]:\ Leaving\ directory\ `%f',
+         \%DMaking\ %*\\a\ in\ %f,
+         \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save