chg: simplifying build logic - a simple line in the documentation should save us the code here

Directory.Build.targets

@@ -7,20 +7,4 @@
   <PropertyGroup Condition="'$(MSBuildProjectName)' == 'Raylib-cs' And '$(RuntimeIdentifier)' == 'browser-wasm'">
     <OutputType>Library</OutputType>
   </PropertyGroup>
-
-  <!-- Raylib-cs 8.1.0 is not on nuget.org yet; pack locally so Examples and tests resolve the package with native runtimes. -->
-  <Target Name="_EnsureLocalRaylibCsPackage"
-          BeforeTargets="Restore"
-          Condition="'$(MSBuildProjectName)' != 'Raylib-cs' And Exists('$(MSBuildThisFileDirectory)Raylib-cs/Raylib-cs.csproj')">
-    <PropertyGroup>
-      <_LocalNuGetDir>$(MSBuildThisFileDirectory)nuget</_LocalNuGetDir>
-      <_LocalRaylibCsNupkg>$(_LocalNuGetDir)/Raylib-cs.$(RaylibCsVersion).nupkg</_LocalRaylibCsNupkg>
-    </PropertyGroup>
-    <MakeDir Directories="$(_LocalNuGetDir)" Condition="!Exists('$(_LocalNuGetDir)')"/>
-    <MSBuild Projects="$(MSBuildThisFileDirectory)Raylib-cs/Raylib-cs.csproj"
-             Targets="Restore;Pack"
-             Properties="Configuration=Release;PackageOutputPath=$(_LocalNuGetDir)"
-             RemoveProperties="RuntimeIdentifier;RuntimeIdentifiers;SelfContained;_IsPublishing"
-             Condition="!Exists('$(_LocalRaylibCsNupkg)') Or '$(ForceRaylibCsPack)' == 'true'"/>
-  </Target>
 </Project>

README.md

@@ -65,6 +65,25 @@ otherwise the command won't work.
 
 5. Start coding!
 
+## Building from source
+
+The `Examples` and `Raylib-cs.Tests` projects consume the binding as a NuGet package, and the in-repo
+version may not be published on nuget.org yet. Pack it once into the local feed before the first build:
+
+```
+dotnet pack Raylib-cs -c Release -o nuget
+dotnet build
+```
+
+`NuGet.config` points restore at the local `./nuget` feed, so both projects pick up the freshly packed
+package. If you skip the pack step on a fresh clone, restore fails with NU1301 (the `./nuget` source
+doesn't exist) or NU1102 (Raylib-cs not found) — running the pack command fixes both.
+
+When iterating on the binding itself, note that NuGet caches the extracted package by version and
+ignores repacks of the same version. After repacking, delete the old package from `./nuget` and clear
+the cached copy (`dotnet nuget locals global-packages --clear`, or delete
+`~/.nuget/packages/raylib-cs/<version>`) before restoring again.
+
 ## Hello, World!
 
 ```csharp