add translation example
Author: thevasudevgupta
Pull request: yes

# What does this PR do?

This PR will add translation example to the repo as per discussion with @thomwolf. 

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## Who can review?

Anyone in the community is free to review the PR once the tests have passed.

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Comments:
Hi, @vasudevgupta7  thanks for adding this! 
Could you link this notebook in the community notebooks table [here](https://github.com/huggingface/transformers/tree/master/notebooks#community-notebooks) instead of adding it to `/notebooks`   

done.

Thanks!

I re-worded the description a bit, hope you don't mind ;)