work on generating main.go and use config not hardcoded vals

app.go

@@ -0,0 +1,31 @@
+package tuugen
+
+import (
+	"embed"
+	"html/template"
+	"os"
+	"path/filepath"
+)
+
+func GenerateMain(FS embed.FS, cfg Config) error {
+	t, err := template.ParseFS(FS, "templates/main.go.tmpl")
+	if err != nil {
+		return err
+	}
+
+	outputFile := "cmd/app/main.go"
+	fp := filepath.Dir(outputFile)
+	if err := os.MkdirAll(fp, 0777); err != nil {
+		return err
+	}
+
+	f, err := os.Create(outputFile)
+	if err != nil {
+		return nil
+	}
+
+	if err := t.Execute(f, cfg); err != nil {
+		return err
+	}
+	return nil
+}