Set up .env in react project tips

Found this tips while i'm fetching issue set up .env variable in react project

• The .env file should be in the root for you application folder. That is one level above your src folder, the same place where you have your package.json
• The variable should be prefixed with REACT_APP_You need to restart the server to reflect the changes in your code.
• You should access the variable in your code like thisprocess.env.REACT_APP_SOME_VARIABLE
• No need to wrap your variable value in single or double quotes.
• Do not put semicolon ; or comma , at the end of each line.

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