add examples for Promises and async-await

Sascha Schulz

2023-05-23 95aa1eb63a9a69e3e4a3de2699b78cb1903cdf88

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const p = new Promise(function(resolve, reject) { 
    resolve("ok"); 
}); 
 
p.then(function(value) { 
    console.log(value); 
});