Add PowerShell build script and update .gitignore to include goengine.exe

Author: RubikNube

.gitignore

@@ -6,3 +6,4 @@ libgoengine.h
 libgoengine.so
 goengine
 ctypes
+goengine.exe

build.ps1

@@ -0,0 +1,30 @@
+# PowerShell build script for GoInGo
+Write-Host "Running tests..." -ForegroundColor Green
+go test ./pkg/...
+
+if ($LASTEXITCODE -ne 0) {
+    Write-Host "Tests failed. Exiting build process." -ForegroundColor Red
+    exit 1
+}
+
+Write-Host "Building main executable..." -ForegroundColor Green
+$env:CGO_ENABLED = "1"
+go build -o goengine.exe ./cmd/main.go
+
+Write-Host "Checking CGO availability..." -ForegroundColor Yellow
+
+$cgoEnabled = (go env CGO_ENABLED)
+if ($cgoEnabled -eq "1") {
+    Write-Host "Building shared library..." -ForegroundColor Green
+    go build -buildmode=c-shared -o libgoengine.so ./export/export.go
+    if ($LASTEXITCODE -eq 0) {
+        Write-Host "Build completed successfully!" -ForegroundColor Green
+    } else {
+        Write-Host "Shared library build failed, but main executable was built successfully." -ForegroundColor Yellow
+    }
+} else {
+    Write-Host "CGO is disabled. Skipping shared library build." -ForegroundColor Yellow
+    Write-Host "To enable CGO, install a C compiler (like MinGW-w64) and set CGO_ENABLED=1" -ForegroundColor Yellow
+}
+
+Write-Host "Build process completed!" -ForegroundColor Green