Update README.md

Author: dbirman

README.md

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 [Launch the web app](http://data.virtualbrainlab.org/Pinpoint/) for more instructions see the [documentation](https://virtualbrainlab.org/02_traj_planner/01_tp_intro.html).
 
+Desktop builds are available on the [Releases](https://github.com/VirtualBrainLab/Pinpoint/releases) page.
+
 # References
 
 Inspired by the trajectory explorer by Andy Peters https://github.com/petersaj/neuropixels_trajectory_explorer.