feat: added mathopt chapter

Author: d-krupke

.gitignore

@@ -157,3 +157,4 @@ evaluations/tsp/2023-11-18_tsplib/PRIVATE_DATA
 tests/test_data/knapsack
 .mdbook/chapters/machine_learning.md
 .mdbook/test_driven_optimization.md
+.mdbook/mathopt.md

.mdbook/SUMMARY.md

@@ -27,3 +27,4 @@
 - [CP-SAT vs. ML vs. QC](./chapters/machine_learning.md)
 - [Large Neighborhood Search](./09_lns.md)
 - [Benchmarking your Model](./08_benchmarking.md)
+- [MathOpt](./mathopt.md)