Use rayon to speed up percentage calculations, add readme

2023-03-11 22:21:07 +10:30
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+# Fast Coster
+
+A business costing system that is super fast:
+
+- Money movements in less than a second
+- Overhead allocation in ~2s for large datasets (~10000 departments) and not flushing every from record - up to 10s when flushing from/to allocations
+
+## General Notes
+
+Setting the number of threads in overhead allocation: set RAYON_NUM_THREADS environment variable ([doc](https://github.com/rayon-rs/rayon/blob/master/FAQ.md)).
+Note multithreading is only currently used to calculate allocation percentages, it is not used in the main allocation processing.