Add Makefile target for python support testing and some README

[alaindargelas]

@Thomasb81 , Please add a top Makeflie test target for python:

make test_python

Also add the new target in the CI Action testing:

UHDM/.github/workflows/main.yml

Line 88 in eef0530

make test

Also, please add some documentation in the README

[Thomasb81]

2 tests are run when UHDM is compile with BUILD_SHARED_LIBS and test are run. (integrated to ctest framework)

UHDM/python/CMakeLists.txt

Line 47 in 04da4ce

add_test(

UHDM/python/CMakeLists.txt

Line 52 in 04da4ce

add_test(

It seems to me that BUILD_SHARED_LIBS case is already integrated in workflow :

UHDM/.github/workflows/main.yml

Line 97 in eef0530

make test

Do we need more ?
Sorry it is not clear what to do unless if it is in the perspective of #911 then it will require a specific entry in the workflow.

[alaindargelas]

I can't see this running in the Actions, can you point to an Action log that shows these tests are actually been executed in the CI?
I think something is missing here.
What I see is this (The build part):
https://github.com/chipsalliance/UHDM/actions/runs/4715955473/jobs/8363259020#step:14:678
But I don't see any tests running.

Also, please add a section in the README on how one would use this? (Set the compile option, run a test).

[Thomasb81]

But I don't see any tests running.

https://github.com/chipsalliance/UHDM/actions/runs/4737059941/jobs/8409401013?pr=923#step:14:431

This aspect should be ok. Tests are run in the workflow now.

Also, please add a section in the README on how one would use this? (Set the compile option, run a test).

I add the required paragraph with python code given as example. In some way it contributes to #783