Add Continuous integration and start lesson plan

[richelbilderbeek]

Hi @pmitev,

With this Pull Request I add two extra continuous integrations scripts:

• spell checking: works great, I've fixed the existing spelling errors too
• link checking: works great. There are 4 broken links, I put those in mlc_config.json as exceptions, as I cannot fix those for you

Also I added a (start of a ) lesson plan for Monday and a picture.

If you want to keep most, I hope you will accept this PR and delete the stuff you do not like :-)

Cheers, Richel

[richelbilderbeek]

@pmitev I would enjoy an 'Accept' or 'Reject' or 'Request changes'. What will it be?

[richelbilderbeek]

To sum up a discussion on Slack:

• Problem: CI is useful, but it should never get in the way
• Answer: It will not let it get in the way either, I will only make it point out mistakes

Merging (when the build passes cleanly, of course) :-)