Add HelloWorld app

internal_filesystem/apps/com.micropythonos.helloworld/META-INF/MANIFEST.JSON

@@ -0,0 +1,25 @@
+{
+"name": "HelloWorld",
+"publisher": "MicroPythonOS",
+"short_description": "Minimal app",
+"long_description": "Demonstrates the simplest app.",
+"icon_url": "https://apps.micropythonos.com/apps/com.micropythonos.helloworld/icons/com.micropythonos.helloworld_0.0.2_64x64.png",
+"download_url": "https://apps.micropythonos.com/apps/com.micropythonos.helloworld/mpks/com.micropythonos.helloworld_0.0.2.mpk",
+"fullname": "com.micropythonos.helloworld",
+"version": "0.0.2",
+"entrypoint": "assets/hello.py",
+"category": "development",
+"activities": [
+    {
+      "entrypoint": "assets/hello.py",
+      "classname": "Hello",
+      "intent_filters": [
+        {
+          "action": "main",
+          "category": "launcher"
+        }
+      ]
+    }
+  ]
+}
+

internal_filesystem/apps/com.micropythonos.helloworld/assets/hello.py

@@ -0,0 +1,10 @@
+from mpos.apps import Activity
+
+class Hello(Activity):
+
+    def onCreate(self):
+        screen = lv.obj()
+        label = lv.label(screen)
+        label.set_text('Hello World!')
+        label.center()
+        self.setContentView(screen)