Enhance README with FORM system description

Added a brief description of the FORM system's capabilities.

Author: contagon

README.md

@@ -9,6 +9,7 @@
 <a href="https://arxiv.org/abs/2510.09966"><img src="https://img.shields.io/badge/arXiv-2510.09966-b31b1b.svg" /></a>
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 FORM is a LiDAR Odometry system that performs fixed-lag **smoothing** and sub-map **reparations**, all in **real-time** with minimal parameters.
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@@ -70,4 +71,4 @@ If you use FORM for any academic work, please cite:
   primaryClass={cs.RO},
   url={https://arxiv.org/abs/2510.09966}, 
 }
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+```