Appveyor: added installation of .NET SDK (#445)

BuildTools/Scripts/appveyor/install.ps1

@@ -0,0 +1,21 @@
+$DOTNET_URL = "https://dot.net/v1/dotnet-install.ps1"
+$CMAKE_URL  = "https://github.com/Kitware/CMake/releases/download/v3.23.3/cmake-3.23.3-windows-x86_64.zip"
+
+# Install .NET
+Invoke-WebRequest $DOTNET_URL -OutFile "dotnet-install.ps1"
+./dotnet-install.ps1 -Version 6.0.100 -InstallDir "C:\Program Files\dotnet"
+
+# Install CMake
+Invoke-WebRequest $CMAKE_URL -OutFile "cmake.zip"
+Expand-Archive -Path cmake.zip -DestinationPath C:\projects\deps -Force
+
+# Configuring environment
+Move-Item -Path (Get-ChildItem C:\projects\deps\cmake-* | Select-Object -ExpandProperty FullName) -Destination C:\projects\deps\cmake -Force
+$env:PATH = "C:\projects\deps\cmake\bin;C:\Python37-x64;$env:PATH"
+
+# Check dependencies 
+cmake --version
+python --version
+
+Write-Host "Available .NET SDK versions:"
+dotnet --list-sdks

appveyor.yml

@@ -29,7 +29,7 @@ clone_folder: c:\projects\DiligentCore
 install:
   # clone submodules
   - git submodule update --init --recursive
-  - BuildTools\Scripts\appveyor\install.bat
+  - ps: .\BuildTools\Scripts\appveyor\install.ps1
 
 before_build:
   - 'cd %APPVEYOR_BUILD_FOLDER%\BuildTools\FormatValidation'