Add new sound effects for Santa's Sleigh

[faucomte97]

Task Description

In December, the Van is replaced by Santa's Sleigh with Rapid Rudolph and all the levels become snow levels! However, the sound effects remain the Van's sound effects, including the van's engine sound and the horn sound. Let's add in two new sound files for the Sleigh to turn those into festive sounds.

These sounds can both be heard in action in level 38, for example.

Acceptance Criteria

• [ ] Ask a member of the team for the sound files.
• [ ] Load in the sleigh bells sound instead of the engine startup sound only when it's December.
• [ ] Load in the clown horn sound instead of the van horn sound only when it's December.

Good places to start

• Sound module: https://github.com/ocadotechnology/rapid-router/blob/71548637958faffdb2726508ff4f911a5cc0b296/game/static/game/js/sound.js

[alkezz]

Hello! I'd like to work on this issue if possible :)

[faucomte97]

Hi @alkezz, of course! Before you start, please can you read through our Contributor Agreement and follow the steps at the bottom of the file so we can verify and add you as an official contributor.

Feel free to start the work on the task too but we will only be able to approve PR check runs, review and merge the PR once you've become an official contributor on the list.