add examples for Promises and async-await

Sascha Schulz

2023-05-23 95aa1eb63a9a69e3e4a3de2699b78cb1903cdf88

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const fs = require("fs"); 
 
fs.readFile("./hello.txt", {encoding: "utf8"}, function(error, data) { 
    console.log(data); 
});