Add Monthly Downloads Badge to README

[ayushjain01]

Added a badge displaying the monthly download count from pip Trends. You can view more details at - https://piptrends.com/package/jupyterlab-server

(If necessary, the link from the badge to the package's pip Trends page can be removed. We just want to showcase a badge we have created.)

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[fcollonval]

Closing as piptrends has far too much trackers (I have 17 elements blocked by my browser filter...) and has commercial interest.

Using https://pypistats.org would make more sense.

[ixmatus]

@fcollonval a colleague of this person tried to open this exact PR against a project I'm the maintainer for as well (ixmatus/inflector#16). This is a promotional campaign and they (or colleagues) appear to be doing it on reddit too, I think this is suspicious activity. They are creating an external dependency on a web property that (as far as I can tell) is not officially blessed by pypi. I think rejecting this PR was a good choice.

Users can get package statistics from libraries.io which is linked to directly by pypi itself.

[fcollonval]

Thanks for sharing the info @ixmatus