What is the new or updated feature that you are suggesting?

When creating a remix project,create-remix should detect if user is using yarn.

If user uses yarn:

• it should ask "Do you want me to run 'yarn install'?" instead of the default "Do you want me to run 'npm install'"
• Use yarn install to install such dependencie

Why should this feature be included?

For yarn users:

• It is a bit odd to ask "Do you want me to run 'npm install'" when you are creating the project using yarn.
• Using yarn to install the dependencies lets remix generate yarn's correct lock files (yarn.lock instead of package-lock.json)