Revise docs and struct name; add basic MPI test

test/src/solution/methods/ProgressiveHedging/ph.jl

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+using Cbc
+using MPI
+using JuMP
+using UnitCommitment
+
+UnitCommitment._setup_logger(level = Base.CoreLogging.Error)
+function fixture(path::String)::String
+    basedir = dirname(@__FILE__)
+    return "$basedir/../../../../fixtures/$path"
+end
+
+# 1. Initialize MPI
+MPI.Init()
+
+# 2. Configure progressive hedging method
+ph = UnitCommitment.ProgressiveHedging()
+
+# 3. Read problem instance
+instance = UnitCommitment.read(
+    [fixture("case14.json.gz"), fixture("case14.json.gz")],
+    ph,
+)
+
+# 4. Build JuMP model
+model = UnitCommitment.build_model(
+    instance = instance,
+    optimizer = optimizer_with_attributes(Cbc.Optimizer, "LogLevel" => 0),
+)
+
+# 5. Run the decentralized optimization algorithm
+UnitCommitment.optimize!(model, ph)
+
+# 6. Fetch the solution
+solution = UnitCommitment.solution(model, ph)
+
+# 7. Close MPI
+MPI.Finalize()

test/src/solution/methods/ProgressiveHedging/usage_test.jl

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+# UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+# Copyright (C) 2020, UChicago Argonne, LLC. All rights reserved.
+# Released under the modified BSD license. See COPYING.md for more details.
+
+using MPI
+
+function solution_methods_ProgressiveHedging_usage_test()
+    basedir = dirname(@__FILE__)
+    @testset "ProgressiveHedging" begin
+        mpiexec() do exe
+            return run(
+                `$exe -n 2 $(Base.julia_cmd()) --project=test $basedir/ph.jl`,
+            )
+        end
+    end
+end