🚀 Feature: Add WhatsApp with Vonage for Java

Appwrite Functions allow you to extend and customize your Appwrite server functionality by executing your custom code. 🤩 You can learn more at our official [Appwrite Functions docs](https://appwrite.io/docs/functions).

Your task is to implement the WhatsApp with Vonage function in Java. You can look at the existing [Appwrite Functions Templates](https://github.com/appwrite/templates) in another coding language.

Your function should behave and be implemented similarly to existing WhatsApp with Vonage Node.js template.

### Tasks summary:

- [ ] Fork & clone Appwrite's [templates](https://github.com/appwrite/templates) repository
- [ ] Create a branch `feat-implement-whatsapp-with-vonage-java`
- [ ] Write code for the function in folder `java/whatsapp-with-vonage/`.
- [ ] Test the function using Appwrite, **provide a video**.
- [ ] Write a `README.md` explaining what the function does, how to use it, and customize it. Here is [an example](https://github.com/appwrite/templates/tree/main/node/whatsapp-with-vonage).
- [ ] Submit a pull request to our [templates](https://github.com/appwrite/templates) repository

If you need any help, contact us on our [Discord server](https://discord.gg/GSeTUeA).

Are you ready to work on this issue? 🤔 Let us know, and we will assign it to you 😊

**Happy Appwriting!**