feat(meshIO): added basic mesh reading implimentation

also added basic unit sphere mesh file which can be rescaled

src/meshIO/private/meshIO.cpp

@@ -0,0 +1,37 @@
+#include "mfem.hpp"
+#include <string>
+#include <iostream>
+#include <fstream>
+
+#include "meshIO.h"
+
+
+MeshIO::MeshIO(const std::string &mesh_file)
+{
+    mesh_file_ = mesh_file;
+    std::ifstream mesh_stream(mesh_file);
+    if (!mesh_stream)
+    {
+        throw std::runtime_error("Mesh file not found: " + mesh_file);
+        loaded_ = false;
+    }
+    else
+    {
+        mesh_ = mfem::Mesh(mesh_stream, 1, 2);
+        loaded_ = true;
+    }
+}
+
+MeshIO::~MeshIO()
+{
+}
+
+bool MeshIO::IsLoaded() const
+{
+    return loaded_;
+}
+
+mfem::Mesh& MeshIO::GetMesh()
+{
+    return mesh_;
+}