add documentation and include fltk and GraphLib as dependencies

CMakeLists.txt

@@ -1,13 +1,39 @@
 cmake_minimum_required(VERSION 3.0)
-
 project(cpp-main)
 
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1y -Wall -Wextra")
+# setting the needed compile flags
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
 
+# append the cmake search path to include the cmake-files to help build the
+# project in lib/GraphLib/cmake_modules
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/lib/GraphLib/cmake_modules")
 
+# these two lines sets the variables starting with MathGL and FLTK used by
+# add_executable and include_directories.
 find_package(MathGL REQUIRED)
+find_package(FLTK REQUIRED)
+
+# these two lines turn off building of tests and examples of the GraphLib library
+# building of tests and examples is rarely done while developing.
+# see ./lib/GraphLib/CMakeLists.txt:L23 to see how these affect the library.
+set(BUILD_EXAMPLES off)
+set(ENABLE_TESTING off)
 
+# this line includes the library GraphLib in lib/GraphLib
 add_subdirectory("./lib/GraphLib")
 
-add_executable(cpp-main main.cpp ${MATHGL_LIBRARIES})
+include_directories(
+  ${MathGL_INCLUDE_DIRS}
+  ${FLTK_INCLUDE_DIR}
+
+  # The following line might also be ${PROJECT_SOURCE_DIR}/lib/GraphLib/graphlib
+  # If your examples say #include <graphlib/gl> you keep the next value as
+  # ${PROJECT_SOURCE_DIR}/lib/GraphLib. If it is #include <gl> you change it to
+  # how its mentioned before.
+  ${PROJECT_SOURCE_DIR}/lib/GraphLib
+)
+
+add_executable(cpp-main main.cpp ${MATHGL_LIBRARIES} ${FLTK_LIBRARIES})
+
+
+# final notes

README.md

@@ -3,8 +3,9 @@
 ## Usage
 ```sh
 git clone https://voss.sarvern.no/zalox/cpp-skeleton-graphlib-fltk <project-name>
+# with juci you can stop after this step and open the folder <project-name> is
+# saved and press Ctrl+Enter
 cd <project-name>
-# with juci you can stop on this step and open the folder <project-name> is saved and press Ctrl+Enter
 mkdir build
 cd build
 cmake ..
@@ -16,5 +17,10 @@ make
 Arch:
 ```sh
 # use yay, pacaur or yaourt
-yay -S mathgl blas
+yay -S mathgl blas fltk
-```
+# the `doxygen` package is optional for generation of html documentation
+# Note: MathGl can take a while to build on slow systems – such as a laptop.
+```
+
+## NOTE
+See notes in CMakeLists.txt