add pond - an interactive simulation (rothgar#468)

Author: vernalan

README.md

@@ -643,6 +643,7 @@
 - [astroterm](https://github.com/da-luce/astroterm) A planetarium for your terminal! Explore stars, planets, constellations, and more
 - [neo](https://github.com/st3w/neo) Simulates the digital rain from "The Matrix"
 - [rxpipes](https://github.com/inunix3/rxpipes) 2D recreation of the ancient Pipes screensaver for terminals.
+- [pond](https://gitlab.com/alice-lefebvre/pond) A soothing in-terminal idle screen that simulates a little pond.
 
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