Add a composer.json file to the project

[wgilling]

In order to pull this module into an Islandora project's drupal, that composer file references this module but this causes an error:

No valid composer.json was found in any branch or tag of https://github.com/Born-Digital-US/islandora_oral_histories.git, could not load a package from it.

Similar to the workbench_integration module, I need to just provide a similar file for this module.

{
  "name": "born-digital-us/islandora_oral_histories",
  "description": "Islandora Oral Histories",
  "type": "drupal-module",
  "keywords": ["Drupal", "Islandora"],
  "license": "GPL-2.0+",
  "homepage": "https://github.com/Born-Digital-US/islandora_oral_histories",
  "support": {
    "issues": "https://github.com/Born-Digital-US/islandora_oral_histories/issues"
  },
  "authors": [
    {
      "name": "Willow Gillingham",
      "email": "willow@born-digital.com",
      "role": "Maintainer"
    }
  ]
}