Adding link to pypi.org in README

Signed-off-by: Loïc Musy <loic.musy@unige.ch>

README.md

@@ -11,7 +11,9 @@ Find the link to the paper here: http://dx.doi.org/10.1016/j.ultramic.2021.11334
 
 We would be gratefull if you cited it if it was usefull for your research
 
-You can install the package using Pip.
+You can install the package using pip, you can find it here https://pypi.org/project/hystorian/.
+
+Simply run: ```pip install hystorian```
 
 ## Structure of an hdf5 file
 An hdf5 file has a tree-like structure consisting of groups (folders) and datasets. Each groups and datasets can have attributes attached to them. An attribute is a small metadata containing informations about the corresponding dataset or group. Here we use them to store general information about the data or parameters of the post-processing.

setup.py

@@ -22,7 +22,6 @@ setuptools.setup(
     long_description_content_type='text/markdown',
     url='https://gitlab.unige.ch/paruch-group/hystorian',
     packages=['hystorian', 'hystorian.io', 'hystorian.processing'],
-    license='CC-By 4.0',
     classifiers=[
         "Programming Language :: Python :: 3",
         "Operating System :: OS Independent",