Added Generate Short URL example in Java

[Pooja444]

Github Issue

Closes: appwrite/appwrite#4191

Description

This change will add the example of generating a short URL using Java. The supported providers are [tinyurl, bitly]
This change also adds a README for deploying the code using docker.

Successful executions

Successful execution using bitly

Successful execution using tinyurl

Errors

Empty payload error

Empty variables error

Empty API key error

No provider error

No URL error

Unsupported provider error

Invalid URL error

[Meldiron]

@Pooja444 , thanks for the PR! 🤯 Please give us some time to review it.

[Meldiron]

Great quality of Java code! 🤯 I left my review, a few small things need to be changed, but other than that, amazing PR. Once my PRs are addressed, I can mark this approved.

[Pooja444]

@Meldiron thanks a lot for your comments! I have addressed them and made the required changes.

[Pooja444]

Tested the changes too -

TinyUrl successful execution -

Bitly successful execution -

TinyUrl key not passed error -

Bitly key not passed error -

[Meldiron]

Looks great to me 😇 🎉🎉🎉

[Pooja444]

Thanks for approving it @Meldiron 😁

[christyjacob4]

THANK YOU! All changes merged 🥳

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