build(libconfig): got build system and tests working

meson.build

@@ -0,0 +1,41 @@
+# ***********************************************************************
+#
+#   Copyright (C) 2025 -- The 4D-STAR Collaboration
+#   File Author: Emily Boudreaux
+#   Last Modified: June 21, 2025
+#
+#   libconstants is free software; you can use it and/or modify
+#   it under the terms and restrictions the GNU General Library Public
+#   License version 3 (GPLv3) as published by the Free Software Foundation.
+#
+#   libconstants is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#   See the GNU Library General Public License for more details.
+#
+#   You should have received a copy of the GNU Library General Public License
+#   along with this software; if not, write to the Free Software
+#   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+#
+# *********************************************************************** #
+project('libconfig', 'cpp', version: 'v1.0.0', default_options: ['cpp_std=c++23'], meson_version: '>=1.5.0')
+
+# Add default visibility for all C++ targets
+add_project_arguments('-fvisibility=default', language: 'cpp')
+
+cpp = meson.get_compiler('cpp')
+subdir('build-config')
+subdir('src')
+subdir('tests')
+
+pkg = import('pkgconfig')
+pkg.generate(
+    name: 'libconfig',
+    description: 'Configuration module for SERiF and related projects',
+    version: meson.project_version(),
+    libraries: [libconfig],
+    subdirs: ['libconfig'],
+    filebase: 'libconfig',
+    install_dir: join_paths(get_option('libdir'), 'pkgconfig')
+)
+