Added file with the solutions to the exercises of lecture 6: bonds and...

Added file with the solutions to the exercises of lecture 6: bonds and spectra. It contains a python code to return the images for question 3.

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• 3af7ebf8 - add the solutions to the TOC

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• 7318033c - Updated the subquestion indices and a fixed small clarification error

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• 5ab12ad8 - Tried to fix the numbered list. Manually inserted the numbered list, so it should work now

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merged

mentioned in commit 518082ba