chore : clean readme

README.md

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 You can find here the C++ code of the Core library of Aidge.
 
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 ## Pip installation
 
 To install aidge_core using pip, run the following command in your python environnement :
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 If you have compiled with PyBind you can find at the root of the ``build`` file the python lib ``aidge_core.cpython*.so``
 
 ## Run tests
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 ### CPP
 
 Inside of the build file run:
 
 ```bash
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 ctest --output-on-failure
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 ```
 
 ### Python