Adds a document to a room.

Adds a document to a room. The following properties in the request body are required. The `folderId` property is optional. All other properties are ignored. - `name` - `base64Contents` If a document with the specified name already exists, a counter is added to the name to make it unique. For example, to create a document named **hello.txt** that contains the text `hello, world`, the body of your request would look like this: ``` { "name": "hello.txt", "base64Contents": "aGVsbG8sIHdvc...