Add GitHub organization JuliaDecisionFocusedLearning (#2384)

Author: gdalle

community/organizations.md

@@ -67,6 +67,7 @@ The following is a non-comprehensive list of Julia GitHub organizations, grouped
 * [JuliaNonconvex](https://github.com/JuliaNonconvex) – Non-convex constrained optimization
 * [JuliaPolyhedra](https://github.com/JuliaPolyhedra) – [Polyhedral computation](https://juliapolyhedra.github.io/)
 * [JuliaSmoothOptimizers](https://github.com/JuliaSmoothOptimizers) – Framework for the development of solvers for continuous nonlinear optimization
+* [JuliaDecisionFocusedLearning](https://github.com/JuliaDecisionFocusedLearning) – Packages that combine machine learning with decision-making
 * [JuliaSparse](https://github.com/JuliaSparse) – Sparse matrix solvers
 * [JuMP-dev (formerly JuliaOpt)](http://jump.dev) – JuMP is a modeling language and supporting packages for mathematical optimization in Julia
 * [SciML (formerly JuliaDiffEq)](https://github.com/SciML) – [Open source software for scientific machine learning](https://sciml.ai) ([Gitter](https://gitter.im/JuliaDiffEq/Lobby))