Update Norm and Learning Sample Readme Files to the Use of CMake

[popescu-v]

Description

Currently, each of the samples projects in src/Norm/samples has a readme.txt file which assumes that the samples are built through Visual Studio.

Also, each of the samples in src/Learning/samples has a readme.txt file which assumes that the genereall.cmd script still exists therein.

Questions/Ideas

• The updates would consist in:
  • Removing all references to Visual Studio specifics (including to the .sln and .vcproj files which are not in the GitHub repository)
  • Removing all references to the genereall.cmd script
  • Documenting the current CMake-based project building workflow
  • Using the markdown format.

Context

• Khiops version : 11
• Log file (use khiops -e log.txt): not applicable
• Scenario file (use khiops -o scenario._kh): not applicable
• OS description (use khiops -s): all supported