Added change cmake task

CMakeLists.txt

@@ -31,4 +31,3 @@ add_library( print_two print_two.cpp )
 add_executable( main main.cpp )
 target_link_libraries( main print_two )
 
-

README.md

@@ -7,4 +7,10 @@ This executable should be placed in the bin/ directory.
 ## Compiling with cmake
 Compile the main.cpp file into an executable using the supplied cmake project file.
 The project file has been set up to produce and executable called "main".
-This should be all the information needed to compile it.
+This should be all the information needed to compile it.
+
+## Editing cmake
+The files passwords.h, passwords.cpp and validate.cpp have been provided for you.
+passwords.h and passwords.cpp contain a pair of functions, validate.cpp contains a main() that uses those functions.
+Edit your CMakeLists.txt file to compile validate.cpp into an executable program called validate.
+passwords.h/.cpp should be treated as a library that is used by validate.cpp.