Embed Notice

Here's a fun example of something you can now do with LLM: search for every README.md file in your home directory and store embeddings for all of them in a collection called "readmes":
```
llm embed readmes \
--model sentence-transformers/all-MiniLM-L6-v2 \
--files ~/ '**/README.md'
```
Then run a similarity search for "sqlite" like this:
```
llm similar readmes -c sqlite
```