Add introductory letter for new team members

Provided tips and advice for the new team based on previous experiences.

to-new-team.md

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+Hello!
+
+This is a small letter from the previous team that worked on this project during the OHTU course. We had a bit of a difficult time getting started ourselves originally, so we've made an effort to ease your burden a little bit by providing some tips and advice.
+
+
+Tips:
+
+If you need to learn the technologies here and get some working hours in, you can do Devops with docker or fullstack open, and mark time spent on those as working time for this course too. Two courses with one stone.
+
+Do a lot of dailies. If you can't have everyone in the same room, do dailies via video call. If you can't arrange a video call, do dailies by text messages. Just do a lot of dailies.
+
+Don't push code to master on the same day as you have a meeting with the customer. Do it at 18:00 the previous evening at the latest. Then you have time to debug when something innevitably breaks.
+
+
+For the future:
+- Consider adding a second production environment for testing before pushing to actual production.
+
+
+!!! ADHERE TO THE DEFINITION OF DONE !!!
+
+If you have any questions or need to get in contact with a member of the previous team, you can email:
+- emil.malk@helsinki.fi