Create a video series about the Bot Framework Composer

Outline features and inner workings.

- [ ] A video about what bot framework composer is, and what it can do by showcasing some sample bots
- [ ] Create a video about language understanding and recognition
- [ ] Create a video about language generation

The issue names no files, tests, or entry points. Start by reviewing the repository's existing homepage and blog content, then define the three requested video topics: Composer basics with sample bots, language understanding and recognition, and language generation. Done means all three videos are created as requested.

Written by the indexing model from the issue text.