Rotate the preview in Classroom

Adds a button to rotate photos/pdf files of student activities in Google Classroom. It doesn't modify the files.

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manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "version": "1.1.2",
  "default_locale": "pt_BR",
  "description": "__MSG_appDesc__",
  "content_security_policy": {
    "extension_pages": "default-src 'self'"
  },
  "content_scripts": [
    {
      "matches": [
        "https://docs.google.com/file/d/*"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "images/icon24.png"
      ],
      "matches": [
        "https://docs.google.com/*"
      ]
    }
  ],
  "action": {
    "default_icon": {
      "16": "images/icon16.png",
      "24": "images/icon24.png",
      "32": "images/icon32.png"
    }
  }
}