Python hello world as first Katacoda scenario

Python/hello-python/finish.md

+Well done, now try a more complex scenario.

Python/hello-python/index.json

+{
+  "title": "Hello Python",
+  "description": "The well known hello world example",
+  "difficulty": "Beginner",
+  "time": "1 minute",
+  "details": {
+    "steps": [
+      {
+        "title": "Step 1",
+        "text": "step1.md"
+      }
+    ],
+    "intro": {
+      "text": "intro.md"
+    },
+    "finish": {
+      "text": "finish.md"
+    }
+  },
+  "files": ["hello-world.py"],
+  "environment": {
+    "uilayout": "editor-terminal",
+    "uisettings": "python"
+  },
+  "backend": {
+    "imageid": "python"
+  }
+}

Python/hello-python/intro.md

+In this scenario you will learn how to write and execute the famous hello world display in Python.

Python/hello-python/step1.md

+Enter the following line in the editor : print("Hello world")
+
+Then execute the script `python hello-world.py`{{execute}}