Update README.md: When to use public folder

[rwieruch]

I ran into this issue as well where I had to use a public folder to make larger (2mb) files (.json) available to my application via the public folder and a symlink to the files in the node_modules folder (how to, issues). Just added this use case to the list of "When to use a public folder" for others in case they run into it as well.

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[rwieruch]

Never mind. It's not working this way (as shown in "how to") for .json files as well. They are still used by the build step and leads to JavaScript heap out of memory. Now I started to include the .json files in the index.html, but this isn't an elegant solution either, because I would have to load the json asynchronously in my JavaScript file afterward.

<script id="data" type="application/json" src="%PUBLIC_URL%/someData.json"></script>

Maybe there is anyway to get it into the script tags body, then it could be loaded synchronously in JavaScript?