Add page on termination conditions

Author: avik-pal

docs/pages.jl

@@ -7,6 +7,7 @@ pages = ["index.md",
                     "basics/NonlinearFunctions.md",
                     "basics/solve.md",
                     "basics/NonlinearSolution.md",
+                    "api/TerminationCondition.md",
                     "basics/FAQ.md"],
     "Solver Summaries and Recommendations" => Any["solvers/NonlinearSystemSolvers.md",
                                                   "solvers/BracketingSolvers.md",

docs/src/basics/TerminationCondition.md

@@ -0,0 +1,11 @@
+# Termination Conditions
+
+Provides a API to specify termination conditions for [`NonLinearProblem`](@ref) and
+[`SteadyStateProblem`](@ref). For details on the various termination modes, i.e.,
+NLSolveTerminationMode, see the documentation for [`NLSolveTerminationCondition`](@ref).
+
+## Termination Condition API
+
+```@docs
+NLSolveTerminationCondition
+```