Add some template code

debug.kv

@@ -0,0 +1,15 @@
+#:import random random
+    
+<Widget>:
+    canvas.after:
+        Color:
+            rgba: 1,1,1,.5
+        Line:
+            rectangle: self.x, self.y, self.width, self.height
+            width: 2
+                
+<DebugLabel@Button>:
+    size: self.parent.size
+    pos: self.parent.pos
+    background_color: random.random(), random.random(), random.random(), 0.6
+    text: 'debuglabel'

helloworld.kv

@@ -0,0 +1,6 @@
+
+#:include debug.kv
+
+<HelloWorld>:
+    DebugLabel:
+        text: 'hello world'

main.py

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+from kivy.app import App
+from kivy.uix.floatlayout import FloatLayout
+
+class HelloWorld(FloatLayout):
+    pass
+
+class HelloWorldApp(App):
+    def build(self):
+        return HelloWorld()
+
+if __name__ == '__main__':
+    HelloWorldApp().run()