examples: add helloworld example

.gitignore

@@ -7,5 +7,4 @@ cmd/handbindings/handbindings
 cmd/handbindings/bindings_test/direct
 cmd/handbindings/bindings_test/testapp
 cmd/genbindings/genbindings
-
+examples/helloworld/helloworld
-

examples/helloworld/main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"miqt/qt"
+)
+
+func main() {
+
+	app := qt.NewQApplication(os.Args)
+	_ = app
+
+	btn := qt.NewQPushButton2("Hello world!")
+	btn.SetFixedWidth(320)
+
+	var counter int = 0
+
+	btn.OnPressed(func() {
+		counter++
+		btn.SetText(fmt.Sprintf("You have clicked the button %d time(s)", counter))
+	})
+
+	btn.Show()
+
+	qt.QApplication_Exec()
+
+	fmt.Println("OK!")
+}