[basics][propertiesheader] update readme

exercises/exercise-basic/README.md

@@ -23,6 +23,8 @@ Locate all the files you will need for this exercise
 * The __main file__ for the __2p2c__ problem : `2p2cmain.cc`
 * The __problem file__ for the __2p__ problem: `injection2pproblem.hh`
 * The __problem file__ for the __2p2c__ problem: `injection2p2cproblem.hh`
+* The __properties file__ for the __2p__problem: `properties2p.hh`
+* The __properties file__ for the __2p2c__problem: `properties2p2c.hh`
 * The shared __spatial parameters file__: `injection2pspatialparams.hh`
 * The shared __input file__: `params.input`
 
@@ -60,7 +62,7 @@ paraview injection-2p2c.pvd
 <hr>
 
 * Copy the main file `2pmain.cc` and rename it to `2pnimain.cc`
-* In  `2pnimain.cc`, include the header `injection2pniproblem.hh` instead of `injection2pproblem.hh`.
+* In  `2pnimain.cc`, include the header `properties2pni.hh` instead of `properties2p.hh`.
 * In  `2pnimain.cc`, change `Injection2pCC` to `Injection2pNICC` in the line `using TypeTag = Properties::TTag::Injection2pNICC;`
 * Add a new executable in `CMakeLists.txt` by adding the lines
 
@@ -81,7 +83,9 @@ make exercise_basic_2pni # builds new executable
 ### Task 4: Setting up a non-isothermal __2pni__ test problem
 <hr>
 
-* Open the file `injection2pniproblem.hh`. It is a copy of the `injection2pproblem.hh` with some useful comments on how to implement a non-isothermal model. Look for comments containing
+* Open the files `injection2pniproblem.hh` and `properties2pni.hh`.
+These are a copies of the `injection2pproblem.hh` `properties2pni.hh` files, with some useful comments on how to implement a non-isothermal model. 
+Look for comments containing
 
 ```c++
 // TODO: dumux-course-task 4