Take user input for port

[achhayapathak]

Right now the PORT on which the server is hosted is hardcoded. Take PORT no as input from the user and check if it is correct and available then host a server on that port otherwise display an error message.

[yashkathe]

Hey @achhayapathak can you assign this issue to me?

P.S.I tested your code and I like your project, I will keep contributing to opened issues

[achhayapathak]

Hi @yashkathe, I would be more than happy if you contribute to the project. Though couple of things I would like to mention before you start contributing:

1. Please read about software versioning here: https://semver.org/ . In this project, I am following the MAJOR.MINOR.PATCH versioning format and I update the version of the application in the package.json file everytime I make a commit. This has to be done as we are developing an npm package where versioning is important. So whenever you make a commit make sure to update the version according to the change.
2. Please follow the standard commit message format that I am using, here is an example: v1.3.8 bug-fix: removed the provenance flag. It starts with the current version and then mentions whether the update was a bug-fix, an enhancement or a feature and then you provide the description of the change.

[achhayapathak]

I have added some instructions in the Readme file but in case you want to contribute there as well I will be more than happy!