update README and update launch files

env_manager/CMakeLists.txt

@@ -68,12 +68,12 @@ if(NOT WIN32)
     "${ament_cmake_package_templates_ENVIRONMENT_HOOK_LIBRARY_PATH}")
 endif()
 
-add_executable(main
+add_executable(env_manager_node
     src/main.cpp
     )
-target_link_libraries(main env_manager lua glog)
+target_link_libraries(env_manager_node env_manager lua glog)
 ament_target_dependencies(
-    main
+    env_manager_node
     Boost
     rcl
     rclcpp
@@ -96,7 +96,7 @@ install(
 )
 
 install(
-    TARGETS main
+    TARGETS env_manager_node
     DESTINATION lib/${PROJECT_NAME}
     )