add mongodb installation notes

Sascha Schulz

vor 4 Tagen c98907289eb9db87a5bea37f2e2c39d6d1f59ce5

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const p = new Promise(function(resolve, reject) { 
    reject(new Error("Fehler")); 
}); 
 
p.catch(function(e) { 
    console.log(e.message); 
});