Add fm set username command

Beginning of the command. Can't do anything other than setting and
updating your lastfm username.

server/createLastfmTable.js

@@ -0,0 +1,21 @@
+const sqlite3 = require('sqlite3').verbose();
+module.exports = async function () { 
+    const db = new sqlite3.Database('data/database.db');
+    return new Promise ((resolve, reject)=>{
+        db.run(
+            `CREATE TABLE IF NOT EXISTS lastfm (
+                        userID INTEGER PRIMARY KEY, 
+                        lastfmUsername TEXT)`,
+            (err) => {
+                if (err) {
+                    console.error(`Error while creating table 'lastfm': ${err}`);
+                    reject(err);
+                } else {
+                    console.log("Table 'lastfm' created successfully.");
+                    resolve();
+                }
+                db.close();
+            }
+        );
+    })
+}