Add metadata to all subfolders

[unforswearing]

Metadata (such as newReminder.meta.json) will provide data on individual scripts, help improve documentation for each snippet, and serve as a framework for future script tests.

Metadata will exist as a Metadata folder in each snippet subfolder (where appropriate).

Example of a <script>.meta.json file (actual format TBD):

{
  "filename": "listFolderContents.applescript",
  "title": "List Folder Contents",
  "description": "Prompts the user to select a folder, retrieves the names of all files in that folder, and allows the user to save the list to a new text file.",
  "author": "unforswearing",
  "created": "2020-01-01",
  "tested_on": ["macOS 10.13 High Sierra"],
  "tags": ["folder", "finder", "export", "files", "write"],
  "category": "File and Folder Actions",
  "dependencies": ["Finder.app"],
  "status": "Stable",
  "notes": "Combines selected files and all files in a folder into one list."
}