Added database + notes system as example.

.gitignore

 token.json
-node_modules
\ No newline at end of file
+node_modules
+database/data/
\ No newline at end of file

core/system/note.js

+const db = needs('database');
+
+module.exports = (msg, args) => {
+	if (args.length < 1) {
+		db.get(msg.author.id, "note").then(note => {
+			msg.channel.send("```\n" + note + "\n```");
+		}).catch(e => {
+			msg.reply("You don't have any note! Do `;note <note>` to set it.");
+		});
+		return;
+	}
+	db.put(msg.author.id, "note", args.join(' ')).then(() => {
+		msg.reply("Successfully set your note!");
+	}).catch(e => {
+		msg.reply("Oops! An error occurred! " + e);
+	});
+};
\ No newline at end of file

database/index.js

+const fs = require('fs');
+const path = require('path');
+const levelup = require('levelup');
+const leveldown = require('leveldown');
+
+if (!fs.existsSync('./database/data')) fs.mkdirSync('./database/data');
+
+module.exports = {
+	put: (id, key, value) => {
+		return new Promise((resolve, reject) => {
+			let db = levelup(leveldown(path.resolve('./database/data/' + id)))
+			db.put(key, value).then(resolve).catch(reject);
+			db.close();
+		});
+	},
+	get: (id, key) => {
+		return new Promise((resolve, reject) => {
+			let db = levelup(leveldown(path.resolve('./database/data/' + id)))
+			db.get(key).then(resolve).catch(reject);
+			db.close();
+		});
+	},
+	del: (id, key) => {
+		return new Promise((resolve, reject) => {
+			let db = levelup(leveldown(path.resolve('./database/data/' + id)))
+			db.del(key).then(resolve).catch(reject);
+			db.close();
+		});
+	}
+};
\ No newline at end of file

index.js

 const discord = require('discord.js');
 const chalk = require('chalk');
 const client  = new discord.Client();
+const database = require('./database');
 const services = require('./services');
 const libs = require('./libs');
 const fs = require('fs');
@@ -18,7 +19,7 @@ console.log(chalk`
 
 `.replace(/#/g, chalk.bgMagenta(' ')));
 
-global.components = {discord, client, services, libs};
+global.components = {discord, client, database, services, libs};
 global.needs = (component) => {
 	if (Object.keys(components).indexOf(component) < 0) throw new Error('Not a valid component!');
 	return components[component];

package.json

@@ -20,6 +20,8 @@
   "dependencies": {
     "chalk": "^2.4.1",
     "discord.js": "^11.3.2",
+    "leveldown": "^4.0.1",
+    "levelup": "^3.1.0",
     "node-opus": "^0.3.0",
     "request": "^2.87.0"
   }