docs: improve README of browser-create-react-app

[kvutien]

I found a typo in the last line egt in place of get.

Then I rephrased some sentences. They puzzled me when I read them now from a beginner's point of view (OMG, it's SOO easy to start using jargon prematurely and confuse the reader)

[achingbrain]

This is great, thanks for clearing it up. I've made some minor edits but let's get this in.

[kvutien]

Great. Very kind of you.

This is a bit weird, I don't think we refer to a peer id as an "ident" anywhere else.
...

Ah? OK.

Your are right. It was not "ident", but id is used in App.js lines 7-10. I put a question as comments here, BTW. There was something that puzzled me when I tried to understand the code. I don't have the answer and maybe some other learner may have the same question. You may want to change the comments into your explanation?