Adds <filesystem> library for testing purposes.

DesignEvaluator/src/main.cpp

 #include <iostream>
+#include <filesystem>
 #include <boost/property_tree/xml_parser.hpp>
 #include <boost/property_tree/ptree.hpp>
 
 int main () {
 
-    boost::property_tree::ptree tree1, tree2;
+    std::filesystem::path upstream_file("./test-upstream-files/oldFormat-CSR.xml");
+    std::filesystem::path local_file("./projects/oldFormat-CSR.xml");
+    boost::property_tree::ptree upstream_tree, local_tree;
+
+    // Checking path properties
+    if (std::filesystem::exists(upstream_file)) {
+        std::cout << "File exists" << std::endl;
+    }
+
+    if (std::filesystem::exists(local_file)) {
+        std::cout << "File exists" << std::endl;
+    }
+
+    // Accessing path components
+    std::cout << upstream_file.root_name() << std::endl;
+    std::cout << upstream_file.parent_path() << std::endl;
+    std::cout << upstream_file.filename() << std::endl;
+    std::cout << upstream_file.extension() << std::endl;
+
     try
     {
-        boost::property_tree::read_xml("oldFormat-CSR.xml", tree1);
+        boost::property_tree::read_xml(upstream_file.string(), upstream_tree);
+        boost::property_tree::read_xml(local_file.string(), local_tree);
     }
     catch(const std::exception& e)
     {