adds install

CMakeLists.txt

@@ -51,3 +51,9 @@ if(${BUILD_TESTING})
         ${PROJECT_NAME}
     )
 endif()
+
+include(cmake/install_target.cmake)
+install_library(
+    ${PROJECT_NAME}
+    "${CMAKE_CURRENT_SOURCE_DIR}/include/${PROJECT_NAME}"
+)

cmake/install_target.cmake

@@ -0,0 +1,68 @@
+# Copyright 2025 NWChemEx-Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+include_guard()
+
+function(write_config_file wcf_file)
+    file(WRITE "${wcf_file}" "") # Erases it if it already exists
+    file(APPEND
+        "${wcf_file}"
+        "get_filename_component(_IL_CONFIG_DIR "
+        "\"\${CMAKE_CURRENT_LIST_FILE}\" PATH)\n"
+    )
+    file(APPEND
+        "${wcf_file}"
+        "include(\"\${_IL_CONFIG_DIR}/${il_name}Targets.cmake\")\n"
+    )
+endfunction()
+
+function(install_library il_name il_header_dir)
+    #TODO: Get these values programmatically
+    set(_il_archive_dir lib)
+    set(_il_library_dir lib)
+    set(_il_runtime_dir bin)
+    set(_il_includes_dir include)
+
+    # -- Install target that is a library --
+    install(TARGETS ${il_name}
+        EXPORT ${il_name}Targets
+        ARCHIVE DESTINATION "${_il_archive_dir}"
+        LIBRARY DESTINATION "${_il_library_dir}"
+        RUNTIME DESTINATION "${_il_runtime_dir}"
+        INCLUDES DESTINATION "${_il_includes_dir}"
+    )
+
+    # -- Install CMake Config Files --
+    install(EXPORT ${il_name}Targets
+        FILE ${il_name}Targets.cmake
+        NAMESPACE nwx::
+        DESTINATION "${_il_library_dir}/cmake/${il_name}"
+    )
+
+    set(_il_config_file "${CMAKE_CURRENT_BINARY_DIR}/${il_name}Config.cmake")
+    write_config_file("${_il_config_file}")
+
+    install(FILES "${_il_config_file}"
+        DESTINATION "${_il_library_dir}/cmake/${il_name}"
+    )
+
+    # -- Install Headers --
+    #TODO: Assert il_header_dir isn't empty
+    install(DIRECTORY "${il_header_dir}"
+        DESTINATION "${_il_includes_dir}"
+        FILES_MATCHING
+            PATTERN "*.hpp"
+            PATTERN "*.h"
+    )
+endfunction()