Increment MRTK nightly dependency

Directory.Build.props

@@ -29,7 +29,7 @@
 		<ProjectReference Include="$(MSBuildThisFileDirectory)submodules\MRTK\Source\Evergine.MRTK\Evergine.MRTK.csproj" />
     </ItemGroup>
     <ItemGroup Condition="'$(UseMRTKNuget)'=='true' And '$(ReferenceMRTK)'=='true'">
-		<PackageReference Include="Evergine.MRTK" Version="2023.2.27.1" />
+		<PackageReference Include="Evergine.MRTK" Version="2023.9.25.3-nightly" />
     </ItemGroup>
 
 	<!-- Add-ons packaging -->
@@ -38,7 +38,7 @@
 		<IsAddOnProject Condition="'$(IsAddOnProject)'==''">false</IsAddOnProject>
 	</PropertyGroup>	
 	<ItemGroup Condition="'$(IsAddOnProject)'=='true'">
-		<PackageReference Include="Evergine.Packages.Targets" Version="2023.3.15.1-nightly" />
+		<PackageReference Include="Evergine.Packages.Targets" Version="2023.9.21.1-nightly" />
 	</ItemGroup>
 
 	<!-- Stylecop -->

README.md

@@ -1 +1,18 @@
-# XRV
+# XRV
+
+## How to update to newer Engine version
+
+1. Ensure MRTK is updated to new Evergine version.
+2. Update Engine references in XRV. You can use Evergine Launcher for this (it will automatically update all references).
+3. Update packages targets in _Directory.Build.props_ file.
+```
+	<ItemGroup Condition="'$(IsAddOnProject)'=='true'">
+		<PackageReference Include="Evergine.Packages.Targets" Version="2023.9.21.1-nightly" />
+	</ItemGroup>
+```
+4. **(If you want to create XRV public packages)** Remember to update _Directory.Build.props_ file to point to public MRTK version to be used.
+```
+    <ItemGroup Condition="'$(UseMRTKNuget)'=='true' And '$(ReferenceMRTK)'=='true'">
+		<PackageReference Include="Evergine.MRTK" Version="2023.9.25.3-nightly" />
+    </ItemGroup>
+```