add badges

README.md

@@ -2,6 +2,8 @@
 [![CodeFactor](https://www.codefactor.io/repository/github/jmbhughes/solarannotator/badge)](https://www.codefactor.io/repository/github/jmbhughes/solarannotator)
 [![PyPI version](https://badge.fury.io/py/solarannotator.svg)](https://badge.fury.io/py/solarannotator)
 [![DOI](https://zenodo.org/badge/286337290.svg)](https://zenodo.org/badge/latestdoi/286337290)
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 A tool for annotating solar images with themes. 
 ![](screenshot.png)