fusion PR, removed DSL (#146)

This isolates the Fusion API from the domain specific language.

After an agreement on syntax the DSL would be added as an improvement to
the API.

---------

Co-authored-by: Jeff Nye <jeff@www.condorcomputing.com>

fusion/CMakeLists.txt

@@ -0,0 +1,25 @@
+cmake_minimum_required(VERSION 3.17)
+project(FusionProject)
+
+set(CMAKE_POSITION_INDEPENDENT_CODE ON)
+set(FUSION_TOP ${CMAKE_SOURCE_DIR})
+
+add_subdirectory(fusion)
+add_subdirectory(test)
+
+find_package(Doxygen)
+if(DOXYGEN_FOUND)
+    set(DOXYGEN_IN ${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile)
+    set(DOXYGEN_OUT ${CMAKE_CURRENT_BINARY_DIR}/Doxygen)
+
+    configure_file(${DOXYGEN_IN} ${DOXYGEN_OUT} @ONLY)
+
+    add_custom_target(docs
+                      COMMAND ${DOXYGEN_EXECUTABLE} ${DOXYGEN_OUT}
+                      WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
+                      COMMENT "Generating API documentation with Doxygen"
+                      VERBATIM)
+else()
+    message("Doxygen needs to be installed to generate documentation")
+endif()
+