Update README.md - add link to public doc

README.md

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 ![Mastodon logo](doc/Mastodon-logo-512x512.png)
 
+Read the user and developer documentation [here](https://mastodon.readthedocs.io/).
+
 # Mastodon – a large-scale tracking and track-editing framework for large, multi-view images.
 
 Modern microscopy technologies such as light sheet microscopy allows live sample *in toto* 3D imaging with high spatial and temporal resolution. Such images will be 3D over time, possibly multi-channels and multi-view. Computational analysis of these images promises new insights in cellular, developmental and stem cells biology. However, a single image can amount to several terabytes, and in turn, the automated or semi-automated analysis of these large images can generate a vast amount of annotations. The challenges of big data are then met twice: first by dealing with a very large image, and second with generating large annotations from this image. They will make interacting and analyzing the data especially difficult.