Update index.markdown to include related projects

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+# [Related Projects](#related-projects)
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+* [Autonomous Robust Manipulation via Optimization with Uncertainty-aware Reachability](https://roahmlab.github.io/armour/)
+* [Reachability-based Trajectory Design with Neural Implicit Safety Constraints](https://roahmlab.github.io/RDF/)
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 # [Citation](#citation)
 
 This project was developed in [Robotics and Optimization for Analysis of Human Motion (ROAHM) Lab](http://www.roahmlab.com/) at University of Michigan - Ann Arbor.