finish readme, work on solutions

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 1. USAGE
-TODO
+This project constitutes the puzzle hunt designed for the annual retreat of DFG research training group GK1821 in 2020.
+
+To start, open the file puzzle_handout.pdf and read the instructions there.
+Everything else is supposed to become clear in the course of the puzzle or hoped to be self-explanatory; just start puzzling where you already know what to do.
+You do not need to clone the repository or otherwise download all files belonging to the project -- the puzzle will tell you which ones you need.
+
+If you want to jump ahead to later stages of the puzzle or to otherwise get hints or check your solutions, have a look at solutions.pdf and see the instructions there.
 
 2. ACKNOWLEDGEMENTS
-TODO
+The First Needle is adapted from Project Euler Problem 50, https://projecteuler.net/problem=50 .
+
+The Second Needle is a version of the puzzle given at https://www.mathsisfun.com/puzzles/breaking-up-a-chocolate-bar.html .
+
+The Third Needle is adapted from Project Euler Problem 85, https://projecteuler.net/problem=85 .
+
+The Fourth Needle is a variant of a classic that can be found, for instance, here: https://puzzling.stackexchange.com/questions/54800/5-pirate-puzzle-question .
+
+The Fifth Needle is adapted from Project Euler Problem 31, https://projecteuler.net/problem=31 .
+
+The Sixth Needle is due to StackExchange user Matt Malone and can be found at https://puzzling.stackexchange.com/questions/6138/find-the-letters-that-complete-these-five-patterns .
+
+The Seventh Needle is adapted from Project Euler Problem 108, https://projecteuler.net/problem=108 .
+
+Everything else including, but not limited to, the crossword clues and grid design, is own work.
+
 
 3. LICENSE
-This work is authored by Fabian Kertels.
-It is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
+Created by Fabian Kertels in February 2020.
+This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
 
 To read the license text, see the LICENSE file distributed alongside this work, or visit https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode .
 You can also find a summary of the license contents at https://creativecommons.org/licenses/by-nc-sa/4.0/ .

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