Added express module, also updated README file.

[Nijin-P-S]

Hi @atapas , As mentioned in issues, I have added express module, provided how to create an express application, how to create get, post, etc api's and also how to route the request using express.

I have included the module in main README file also.

Thank you Nijin

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[atapas]

@Nijin-P-S Please resolve conflicts to merge.

[Nijin-P-S]

I have resolved the conflicts. You can now merge the branch.

Thanks.