Add Roc Droid

[gavv]

Add "Roc Droid", and Android app for streaming audio using Roc. Part of https://roc-streaming.org/.

Please complete the following checklist if your PR is adding new link to the list:

• [x] I've read contributing guidelines
• [x] This PR does not introduce duplicates to the list
• [x] The link is added at the bottom of the list category
• [x] Suggested repository is maintained, have active community, is able to mentor new contributors and have issues with the suggested label
• [x] The link I add follows the suggested pattern:

- [Repository Name](link-to-repository-label) _(label: beginner-friendly-label-in-the-repository)_ <br> Description

Example link formatting:

- [awesome-for-beginners](https://github.com/MunGell/awesome-for-beginners/labels/good-first-contribution) _(label: good-first-contribution)_ <br> A list of awesome beginners-friendly projects.