[ex1] Update of readme and CMakeLists

tutorial/ex1/CMakeLists.txt

 # the immiscible two-phase simulation program
 dune_add_test(NAME exercise1_2p
-              SOURCES exercise1_2p.cc)
+              SOURCES exercise1_2p.cc
+              COMMAND ./exercise1_2p exercise1.input)
 
 # the compositional two-phase simulation program
 dune_add_test(NAME exercise1_2p2c
-              SOURCES exercise1_2p2c.cc)
+              SOURCES exercise1_2p2c.cc
+              COMMAND ./exercise1_2p2c exercise1.input)
 
 # add a symlink for the input file
 dune_symlink_to_source_files(FILES "exercise1.input")

tutorial/ex1/README.md

@@ -104,7 +104,7 @@ in the `injection2p2cproblem.hh` file and also remember to also set the paramete
 
 * Check the influence of that parameter on the simulation result by rerunning the simulation with different injection rates. Remember to also set the parameter totalAreaSpecificInflow in the input file.
 
-Again, you don't need to recompile the program.
+Since you have changed your header hile, you have to recompile the program.
 
 <hr><br><br>
 ### 5. Setting up a new executable (for a non-isothermal simulation)