List requirement to use `main` in package.json

Created by: Vinnl

I'm not 100% sure whether main is required to point to template.json, but when I did not include the key altogether, I ran into the following error:

Error: Cannot find module 'cra-template-[template-name]'
Require stack:
- /tmp/my-app/node_modules/react-scripts/scripts/init.js
- /tmp/my-app/[eval]
    at Function.Module._resolveFilename (internal/modules/cjs/loader.js:793:17)
    at Function.resolve (internal/modules/cjs/helpers.js:80:19)
    at module.exports (/tmp/my-app/node_modules/react-scripts/scripts/init.js:110:13)
    at [eval]:3:14
    at Script.runInThisContext (vm.js:116:20)
    at Object.runInThisContext (vm.js:306:38)
    at Object.<anonymous> ([eval]-wrapper:9:26)
    at Module._compile (internal/modules/cjs/loader.js:955:30)
    at evalScript (internal/process/execution.js:80:25)
    at internal/main/eval_string.js:23:3 {
  code: 'MODULE_NOT_FOUND',
  requireStack: [
    '/tmp/my-app/node_modules/react-scripts/scripts/init.js',
    '/tmp/my-app/[eval]'
  ]
}