Add dependencies to README

Author: hackermd

README.md

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 # microscopy-viewer
-Web-based viewer for DICOM Visible Light Whole Slide Microscopy Images
+Web-based viewer for [DICOM Visible Light Whole Slide Microscopy Images](http://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_A.32.8.html).
+
+
+## Dependencies
+
+- [Openlayers](https://openlayers.org) (npm package [ol](https://www.npmjs.com/package/ol))