Add main application entry point and update .gitignore for binary exclusion

Author: bethropolis

.gitignore

@@ -1,5 +1,5 @@
 # Binaries
-dir-dumper
+/dir-dumper
 *.exe
 *.exe~
 *.dll

cmd/dir-dumper/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"os"
+
+	"github.com/bethropolis/dir-dumper/internal/app"
+	"github.com/bethropolis/dir-dumper/internal/config"
+)
+
+func main() {
+	// Load configuration from command-line flags
+	cfg := config.New()
+
+	// Create and run the application
+	application := app.New(cfg)
+
+	// Run the application
+	application.Run()
+
+	// Close output file if one was opened
+	if cfg.OutputFile != "" {
+		if f, ok := application.Output.(*os.File); ok {
+			f.Close()
+		}
+	}
+}