added readme with badge

Author: openmohan

README.md

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 Node work sample which depends on [React Frontend](https://github.com/openmohan/reactjs-work-sample)
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+This project provides API for Roster management and can be deployed parallely with [React Roster Management Frontend](https://github.com/openmohan/reactjs-work-sample).
+https://ci.appveyor.com/api/projects/status/dgx7yenx69o1e5ae/branch/master?svg=true