doc/README: add current status overview

README.md

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 # crowns
 
 AI and simulator for the card game [Five Crowns](https://setgame.com/sites/default/files/instructions/FIVE%20CROWNS%20-%20ENGLISH_2.pdf).
+
+## Status
+
+- [X] Find books and runs in hands including wild cards
+- [X] Tree search to find best combination with lowest outstanding score
+	- [ ] More optimized tree pruning for very large number of wildcards
+- [X] Arbitrary player count
+- [X] Unit test coverage
+- [X] Pluggable strategy architecture
+- [X] Minmax AI strategy
+- [ ] More advanced strategies
+	- [ ] Take what other players are drawing into account, and avoid discarding them
+	- [ ] Avoid discarding wildcards for other players
+	- [ ] Identify what cards would complete a book or run and their drawing odds
+	- [ ] Oracle / "Cheating" strategy
+- [ ] Interactive player
+	- [ ] Graphical UI
+- [ ] Solitaire mode with single deck
+- [ ] Monte carlo analysis on game properties
+	- [ ] Average number of turns per round
+	- [ ] Odds of the starting player winning