Sample Unity package.json to create custom packages

package.json

{
  "name": "com.unity.example",
  "version": "1.2.3",
  "displayName": "Package Example",
  "description": "This is an example package",
  "unity": "2019.1",
  "unityRelease": "0b5",
  "dependencies": {
    "com.unity.some-package": "1.0.0",
    "com.unity.other-package": "2.0.0"
  },
  "keywords": [
    "keyword1",
    "keyword2",
    "keyword3"
  ],
  "author": {
    "name": "My Company",
    "email": "hello@example.com",
    "url": "https://www.mycompany.com"
  }
}