question

You can write a skill that tells the Echo to read any text you like. Note, however, skills are conversational based. The customer says something, your skill replies. It works best for short, focused sections of text. If you want your skill to read, say, a book, it isn't really suitable. I requested the ability to "stream text" like you might stream audio, under feature requests. Something that was asynchronous, that the user could stop/start like music. That would solve those use cases. But, in its present form, you can't really do that with the ASK.

At this time all skills must be initialized by a user stating the Invocation Name. A push notification type of interaction is not allowed.