Create a CLI

[mcmire]

If we want to make a new project derived from this template, the only way is to go to this repo and pressing the "Use this template" button. But this will add a new repo to our GitHub organization right away, and sometimes we don't want to do that, especially if we're building a prototype and don't know if the new project something we'll want to keep long-term.

It would be nice if we could run something like:

yarn create @metamask/module <project-name>

This would act similar to create-react-app. That is, given the name of a project, it would:

• create a new directory locally
• initialize it as a Git repo
• replace all instances of "metamask-module-template" (in package.json, README, etc.) with the name of the project
• remove the "Examples" section from .github/PULL_REQUEST_TEMPLATE
• add an initial commit (called "Initial commit")