test: add instructions for reproducibly building SimpleAdder.fmu

Author: AayushSabharwal

test/extensions/fmus/SimpleAdder/README.md

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+SimpleAdder.fmu is a v2 FMU built using OpenModelica. The file `SimpleAdder.mo` contains the
+modelica source code for the model. The file `buildFMU.mos` is the OpenModelica script used
+to build the FMU.

test/extensions/fmus/SimpleAdder/SimpleAdder.mo

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+block SimpleAdder
+	parameter Real value = 1.0;
+	input Real a;
+	input Real b;
+	Real c(start = 1.0, fixed = true);
+	output Real out;
+	output Real out2;
+equation
+	der(c) = out;
+	out = a + b + value;
+	out2 = 2 * c;
+end SimpleAdder;

test/extensions/fmus/SimpleAdder/buildFmu.mos

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+OpenModelica.Scripting.loadFile("SimpleAdder.mo"); getErrorString();
+
+installPackage(Modelica);
+
+setCommandLineOptions("-d=newInst"); getErrorString();
+setCommandLineOptions("-d=initialization"); getErrorString();
+setCommandLineOptions("-d=-disableDirectionalDerivatives"); getErrorString();
+
+cd("output"); getErrorString();
+buildModelFMU(SimpleAdder, version = "2.0", fmuType = "me_cs"); getErrorString();
+system("unzip -l SimpleAdder.fmu | egrep -v 'sources|files' | tail -n+3 | grep -o '[A-Za-z._0-9/]*$' > BB.log")
+