readme: add mac unsupported notice

README.md

@@ -43,7 +43,7 @@ The AM2RLauncher data can get quite big, so if you wish to change where it store
 
 # Compiling Instructions:
 ## Dependencies
-For compiling for Windows .Net Framework 4.8 SDK is needed. For Linux .Net Core 5.0 SDK is needed.
+For compiling for Windows .Net Framework 4.8 SDK is needed. For Linux and Mac .Net Core 5.0 SDK or later is needed.
 
 ## Windows Instructions
 Open the solution with Visual Studio 2019.  
@@ -52,3 +52,7 @@ Alternatively, build via `dotnet build` /  the `buildAll` batch file.
 ## Linux Instructions
 In order to build for linux, use `dotnet publish AM2RLauncher.Gtk -p:PublishSingleFile=true -p:DebugType=embedded -c release -r ubuntu.18.04-x64 --no-self-contained`, MonoDevelop sadly doesn't work.  
 You *have* to specify it to build for Ubuntu, even on non-Ubuntu distros, because one of our Dependencies, libgit2sharp fails on the `linux-x64` RID.
+
+## Mac Instructions
+You can open the solution with Visual Studio for Mac, but it likely will crash after compliation. Use `dotnet publish AM2RLauncher.Mac -c release` instead.
+Note that Mac is currently **unsupported**. We will try to answer questions, but cannot guarantee to fix issues with Mac.