Added two new pyCSEP tutorials and three input files

[bayonato89]

pyCSEP Pull Request Checklist

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Fixes issue #(please fill in or delete if not needed).

Type of change:

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Documentation update (this pull request adds no new code)

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• New and existing unit tests pass locally with my changes

[pabloitu]

The PR and tutorials looks super. However, and not strictly related to this PR, there is not much structure with the tutorial/examples/notebook files of pycsep. We should make a follow-up PR to rearrange the files contained in both pycsep/examples/tutorials and pycsep/notebooks, and create subfolders to contain all the data therein. Perhaps also create an en/ and es/ folder to separate by languages.