Add sgsR

@tgoodbody

README.md

@@ -1007,6 +1007,7 @@ energy system designs and analysis of interactions between technologies.
 - [gbifdb](https://github.com/ropensci/gbifdb) - Provide a relational database interface to a parquet based serializations of gbif's AWS snapshots of its public data.
 - [diversitree](https://github.com/richfitz/diversitree) - Includes a number of comparative phylogenetic methods, mostly focussing on analysing diversification and character evolution.
 - [aspe](https://github.com/PascalIrz/aspe) - An R package to analyse and visualise river fish data in France.
+- [sgsR](https://github.com/tgoodbody/sgsR) - A structurally guided sampling toolbox for LiDAR-based forest inventories.
 
 
 ### Cryosphere