Add developer jokes service

[GregorBiswanger]

Related to #186

This pull request introduces a new feature to the existing Node.js HTTP API by adding the capability to deliver random developer jokes when accessing the /jokes path.

• Adds an array of developer jokes: An array containing five developer-themed jokes is added to the top of the index.js file.
• Implements a route handler for /jokes: The server now checks if the request URL matches /jokes. If it does, it selects a random joke from the newly added array and returns it as the response.
• Maintains default behavior for other paths: For any other request paths, the server continues to return the "Hello World" message, preserving the original functionality.

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[github-actions[bot]]

In Bezug auf Security:

• Der Code enthält derzeit keine offensichtlichen Sicherheitslücken. Es wird kein Benutzereingaben genutzt und keine sensiblen Daten offenbart.

In Bezug auf Performance:

• Es könnte ein Leistungsproblem geben, wenn die 'jokes' Array in der Zukunft skaliert. Das Durchsuchen einer potenziell großen Array (jokes) mit Math.random() index.js jokes.length bei jeder HTTP-Anforderung kann zu Performanceproblemen führen.

Lösungsansatz:

// Best practice: Auf Daten außerhalb des Anforderungskontexts zugreifen
const jokes = [
 ...
];

const server = http.createServer((req, res) => {

 // HTTP responses should be managed within a switch-case statement for cleaner code
 switch(req.url) {

 // The /jokes case could be managed as follows to avoid overloading server:
 case '/jokes':
 const randomIndex = Math.floor(Math.random() index.js jokes.length);
 res.writeHead(200, {'Content-Type': 'text/plain'});
 res.end(jokes[randomIndex]);
 break;
 // Other cases can be similarly managed:
 case 'otherURL':
 res.writeHead(200, {'Content-Type': 'text/plain'});
 res.end('Some other response');
 break;
 // Always include a default:
 default:
 res.writeHead(200, {'Content-Type': 'text/plain'});
 res.end('Hello, world!');
 break;

 }

});

Ich gebe den PR frei.