Update Teszt_txt.txt, app.yaml, and main.py

Teszt_txt.txt

@@ -1,3 +0,0 @@
-Teszt txt.
-Új tartalom
-Mégújabb valami.

app.yaml

@@ -0,0 +1,21 @@
+app:
+  id: "teszt-python-app"
+  name: "Test Python App"
+  description: "Simple test app for launcher"
+  version: "1.0.0"
+
+runtime:
+  type: "executable"
+
+launch:
+  type: "python"
+  entry: "main.py"
+
+platforms:
+  windows-x64:
+    asset: "teszt-python-app-windows.zip"
+    sha256: null
+
+  linux-x64:
+    asset: "teszt-python-app-linux.tar.gz"
+    sha256: null

main.py

@@ -0,0 +1,2 @@
+print("Hello from launcher test app!")
+input("Press Enter to exit...")