Document how to distribute and import projects

Creating a new project from scratch is obvious, but if an author wished to post his Chalice project for other developers to use, it's less so. I'm guessing the best practice would be:

1. Share your `app.py` for your project `foo`.
2. Instruct other developers to:
1. rtfm Chalice
2. Make a new project: `chalice new-project foo`
3. Overwrite generated `app.py` with the shared `app.py`
4. Deploy: `cd foo && chalice deploy`

Is this correct and is it what's intended? It's straightforward but perhaps indirect. Please throw a paragraph in the README.

Start by reading the README and reviewing the proposed workflow: sharing app.py, running chalice new-project, replacing the generated app.py, and deploying with chalice deploy. Confirm the intended way to distribute and import a Chalice project, then document the approved steps in a README paragraph; done means another developer can follow them without guessing.

Written by the indexing model from the issue text.