Update apireference.md

Author: dourouc05

docs/src/apireference.md

@@ -144,6 +144,7 @@ List of attributes useful for optimizers
 ```@docs
 RawSolver
 ResultCount
+ConflictStatus
 ObjectiveFunction
 ObjectiveFunctionType
 ObjectiveValue
@@ -169,6 +170,15 @@ The value of the attribute is of type `TerminationStatusCode`.
 TerminationStatusCode
 ```
 
+### Conflict Status
+
+The `ConflictStatus` attribute indicates why the optimizer stopped executing.
+The value of the attribute is of type `ConflictStatusCode`.
+
+```@docs
+ConflictStatusCode
+```
+
 ### Result Status
 
 The `PrimalStatus` and `DualStatus` attributes indicate how to interpret the result returned by the solver.
@@ -264,6 +274,7 @@ ConstraintDual
 ConstraintBasisStatus
 ConstraintFunction
 ConstraintSet
+ConstraintConflictStatus
 ```
 
 Note that setting the [`ConstraintFunction`](@ref) of a [`SingleVariable`]