Add deprecation warning. It may help new people (like me) avoid looking for git.sln on the vs/main branch 👍

Author: domsleee

Compiling-Git-with-Visual-Studio.md

@@ -2,6 +2,9 @@ Please note: this page describes how to compile Git's source code in Visual Stud
 
 # Checking out `vs/main`
 
+> [!WARNING]  
+> The `vs/main` branch and `git.sln` is deprecated. The current approach is to open the `git` folder in VS directly, refer to the [README of the `vs/main` branch](https://github.com/git-for-windows/git/tree/vs/main).
+
 Git's source code (and hence also Git for Windows' source code) is [usually built using GNU C and GNU Make in a Git for Windows SDK](https://github.com/git-for-windows/git/wiki/Building-Git).
 
 However, as of Git for Windows v2.11.0, a much more convenient way is available: by cloning https://github.com/git-for-windows/git and checking out the `vs/main` branch, you will automatically have project definitions ready to go with Visual Studio.