added missing delete playlist endpoint

packages/music_server/src/controllers/playlists/routes/delete/:playlist_id.js

@@ -0,0 +1,30 @@
+import { Playlist } from "@models"
+import { AuthorizationError, PermissionError, NotFoundError } from "@classes/Errors"
+
+export default async (req, res) => {
+    if (!req.session) {
+        return new AuthorizationError(req, res)
+    }
+
+    let playlist = await Playlist.findOne({
+        _id: req.params.playlist_id,
+    }).catch((err) => {
+        return false
+    })
+
+    if (!playlist) {
+        return new NotFoundError(req, res, "Playlist not found")
+    }
+
+    if (playlist.user_id !== req.session.user_id.toString()) {
+        return new PermissionError(req, res, "You don't have permission to edit this playlist")
+    }
+
+    await Playlist.deleteOne({
+        _id: req.params.playlist_id,
+    })
+
+    return res.json({
+        success: true,
+    })
+}