Added docker image build status badge

README.md

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 A minimal *Clone* of [Google Keep](https://keep.google.com) written in [ReactJS](https://reactjs.org/) with [Material UI Components](https://material-ui.com/), themed to look exactly like *Google Keep*, with complex features like sharing, archiving, reminders etc. shoved away. The backend is a [GraphQL](https://graphql.org/) server written in [Golang](https://golang.org/), with data persisted in [SQLite](https://sqlite.org) DB file, via [GORM](https://gorm.io). The server implementation is complete with *Cookie based Authentication*, implemented using [Authboss](https://github.com/volatiletech/authboss).
 
+![Docker Image CI](https://github.com/anselm94/googlekeepclone/workflows/Docker%20Image%20CI/badge.svg)
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 ![Light and Dark theme demo](./docs/dark-light-theme.gif)