doc/README: add example usage

README.md

@@ -2,6 +2,29 @@
 
 AI and simulator for the card game [Five Crowns](https://setgame.com/sites/default/files/instructions/FIVE%20CROWNS%20-%20ENGLISH_2.pdf).
 
+## Usage
+
+```bash
+$ /usr/bin/time ./crowns > example.log
+132.35user 2.95system 1:21.78elapsed 165%CPU (0avgtext+0avgdata 112348maxresident)k
+0inputs+176outputs (0major+1031510minor)pagefaults 0swaps
+
+$ tail -n13 example.log 
+P2 taking  3★ from the deck
+P2 discards 10♠ (position 7)
+P3 taking 10♠ from the discard pile
+P3 discards  5♦ (position 6)
+Found 306698 possible groupings
+P0 has [ [[ K♣  4★  4♣] [ K♠  5♠  5♥] [ 6♣  7♣  8♣] [ 6★ Jok  K♣  9★]] leftover [] ] (score: 0)
+Found 12716 possible groupings
+P1 has [ [[ K♥  3♥  3★] [ 5♦  K★  7♦] [Jok 10♦  J♦] [ 7★  8★  9★]] leftover [ 6♥] ] (score: 6)
+P2 has [ [[ 3♦  3★  3♥] [ 4♠  4♦  4★]] leftover [ 9♥  6♦  5♠  5★  9♦  7♣  8♦] ] (score: 49)
+P3 has [ [[ K★  6♦  6★] [10♥ 10♠ 10★] [ 9♣ Jok  J♣  Q♣]] leftover [ 4♣  4♥  3♠] ] (score: 11)
+The round has ended
+Running total scores: [105 102 158 154]
+The game has ended
+```
+
 ## Status
 
 - [X] Find books and runs in hands including wild cards