feat: Create inputAudio controller

see: #10

server/controller/inputAudio.ctrl.js

@@ -0,0 +1,42 @@
+const InputAudio = require("./../models/InputAudio")
+const User = require("./../models/User")
+const fs = require("fs")
+
+module.exports = {
+	addInputAudio: (req, res, next) => {
+		let {text} = req.body
+		// check audio files
+		// if files.audio
+		//    upload
+		// else
+		saveInputAudio({title})
+
+		const saveInputAudio = (obj) => {
+			new InputAudio(obj).save((err, audio) => {
+				if (err)
+					res.send(err)
+				else if (!audio)
+					res.send(400)
+				else {
+					return InputAudio.addAuthor(req.body.author_id).then(_audio =>
+						res.send(_audio)
+					)
+				}
+				next()
+			})
+		}
+	},
+
+	getAll: (req, res, next) => {
+		InputAudio.find(req.params.id)
+			.populate("author")
+	},
+
+	/**
+	 * audio_id
+	 */
+	getInputAudio: (req, res, next) => {
+		InputAudio.findById(req.params.id)
+			.populate("author")
+	}
+}