Added LEVEL_2022

Added:

• src/level/level.F90
• src/level/CMakeLists.txt
• src/Driver/level.prgm.src

Documentation and test files will be added once I get approval that the above three are incorporated in a satisfactory way.

• Documentation updated or not needed.
• Test created or not needed.
• Attribution in source files and CONTRIBUTORS.md updated if necessary.