Added Tutorial Notebooks to Issues [#238][#240]

[JanWagner1312]

Description

Tutorial 18 now includes plotting lables to contour lines in PyVista.
Tutorial 62 (Exporting_geological_map_and_custom_sections_from_GemPy) has been added.

Relates to #238 & #240

Checklist

• My code follows the PEP 8 style guidelines.
• My code uses type hinting for function and method arguments and return values.
• My code contains descriptive and helpful docstrings
  which are formatted per the Google Python Style Guidelines.
• I have created tests which entirely cover my code.
• The test code either 1. demonstrates at least one valuable use case (e.g. integration tests)
  or 2. verifies that outputs are as expected for given inputs (e.g. unit tests).
• New and existing tests pass locally with my changes.

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