Examine source code of Hello Spring

{
  "theme": {
    "images": {
      "theme_frame": "Hello-Springh.JPG"
    },
    "colors": {
      "frame": "#fafaf7",
      "tab_background_text": "#fafaf5"
    }
  },
  "version": "2.0",
  "name": "Hello Spring",
  "manifest_version": 2
}