Added build.ps1 for Windows target, just because I'll forget the compile command on Windows

build.ps1

@@ -0,0 +1,15 @@
+# build.ps1 - configure and build the project (Windows/MSVC)
+
+cmake -B build
+if ($LASTEXITCODE -ne 0) {
+    Write-Error "CMake configure failed."
+    exit $LASTEXITCODE
+}
+
+cmake --build build --config Debug
+if ($LASTEXITCODE -ne 0) {
+    Write-Error "Build failed."
+    exit $LASTEXITCODE
+}
+
+Write-Host "Build succeeded: build\Debug\hello3d.exe" -ForegroundColor Green