add engine requirements to create-turbo/package.json, fix examples/with-pnpm

[charkour]

Hey, didn't know what was best for this, but I thought this PR could be a good starting point.

Currently, the docs do not list out what node version or npm version is necessary to run turborepo and some users have run into issues with it: #184

This PR adds the engine versions to the base package.json for the template in create-turbo and also updates the documentation to specify which versions of node and npm are needed. Adds an .npmrc to enforce the npm version if using npm. I tested different combinations of npm and node versions and concluded turborepo works with node >= v14 and npm >= v7. I didn't try different pnpm versions, but could test that as well if you would like.

Also, maybe it would be good to have create-turbo and the turbo cli check the node and npm version and display an error when the user trys to run commands. If that is a good idea, that is something else this PR could include. As an aside, building and running create-turbo locally works fine but jest was presenting errors.

Thanks for your time!

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[charkour]

Hey, thanks for taking the time to review this.

I have removed the Node and NPM version requirements from the docs as you requested.

Also, I added the minimum PNPM version to the create-turbo/package.json. PNPM added workspaces in v3.7.0 according to their docs which I verified using the examples/with-pnpm project and installing different PNPM versions. The with-pnpm project was missing scripts which were defined in with-pnpm/readme.md and needed turbo dev configuration which I added.

Please let me know what needs to be changed. Thanks!

[jaredpalmer]

Thanks!