docs: getting started

-add nuget instructions for older projects
-add instructions on removing existing assembly references

Author: JonnyOThan

docs/msbuild/getting-started.md

@@ -2,10 +2,16 @@
 
 
 ## Including the Package
-There are several ways to use the KSPBuildTools package in your mod. If you are using
-an [SDK-style csproj file](https://learn.microsoft.com/en-us/dotnet/core/project-sdk/overview), it is recommended to use NuGet
+There are several ways to use the KSPBuildTools package in your mod.  [KSPBuildTools is available on NuGet](https://www.nuget.org/packages/KSPBuildTools), which is the recommended way to use it.
 
-### Install with NuGet
+### Install with NuGet - Older Framework Style projects
+
+1. Right-click on your project file in Visual Studio and select "Manage NuGet Packages."
+2. Search for KSPBuildTools
+3. Optionally, check "Include prerelease" to get access to the bleeding edge of KSPBuildTools
+4. Click "Install"
+
+### Install with NuGet - SDK Style projects
 
 either run the following command:
 
@@ -51,6 +57,15 @@ Then include the targets file in your csproj. Make sure you use the correct path
 
 Or you can copy the files you want into your own repository and use them however you like - though that will make it harder to get updates
 
+### Remove existing assembly references
+
+If you're adding KSPBuildTools to an existing mod, or if you just started a blank project, you likely have some assembly dependencies already in your csproj file.  You need to remove these.  KSPBuildTools will automatically reference the KSP, Unity, and Mono assemblies that are part of your KSP install.  There are a few small differences between those Mono libraries and the regular .net framework ones.
+
+1. Right-click on your project and select "Unload"
+2. Right-click again and select "edit"
+3. Remove ALL `<Reference>` items
+4. Right-click on your project and reload
+
 ## Locating your KSP Install
 
 KSPBuildTools needs to know where you have KSP installed in order to reference the game dlls. These are all specific to your own computer, and should not be included in your git repo.