Add game: EinStein würfelt nicht!

docs/games.md

@@ -33,6 +33,7 @@ Status                                                                 | Game
 🟢                                                                      | [Dots and Boxes](https://en.wikipedia.org/wiki/Dots_and_boxes)                                 | 2       | ✅              | ✅            | Players put lines between dots to form boxes to get points.
 🔶                                                                      | [Dou Dizhu](https://en.wikipedia.org/wiki/Dou_dizhu)                                           | 3       | ❌              | ❌            | A three-player games where one player (dizhu) plays against a team of two (peasants).
 🔶                                                                      | [Euchre](https://en.wikipedia.org/wiki/Euchre)                                                 | 4       | ❌              | ❌            | Trick-taking card game where players compete in pairs.
+🔶                                                                      | [EinStein würfelt nicht!](https://en.wikipedia.org/wiki/EinStein_w%C3%BCrfelt_nicht!)                                                 | 2       | ❌              | ✅            | Players control 6 numbered cubes, selected randomly by the roll of a die. The player that gets on the opponent's board corner, or captures all the opponent's cubes wins.
 🟢                                                                      | [First-price Sealed-Bid Auction](https://en.wikipedia.org/wiki/First-price_sealed-bid_auction) | 2-10    | ❌              | ❌            | Agents submit bids simultaneously; highest bid wins, and that's the price paid.
 🟢                                                                      | [Gin Rummy](https://en.wikipedia.org/wiki/Gin_rummy)                                           | 2       | ❌              | ❌            | Players score points by forming specific sets with the cards in their hands.
 🟢                                                                      | [Go](https://en.wikipedia.org/wiki/Go_\(game\))                                                | 2       | ✅              | ✅            | Players place tokens on the board with the goal of encircling territory.

open_spiel/games/CMakeLists.txt

@@ -71,6 +71,8 @@ set(GAME_SOURCES
   efg_game/efg_game.h
   efg_game/efg_game_data.cc
   efg_game/efg_game_data.h
+  einstein_wurfelt_nicht/einstein_wurfelt_nicht.cc
+  einstein_wurfelt_nicht/einstein_wurfelt_nicht.h
   euchre/euchre.cc
   euchre/euchre.h
   first_sealed_auction/first_sealed_auction.cc
@@ -422,6 +424,10 @@ add_executable(efg_game_test efg_game/efg_game_test.cc ${OPEN_SPIEL_OBJECTS}
                $<TARGET_OBJECTS:tests>)
 add_test(efg_game_test efg_game_test)
 
+add_executable(einstein_wurfelt_nicht_test einstein_wurfelt_nicht/einstein_wurfelt_nicht_test.cc ${OPEN_SPIEL_OBJECTS}
+               $<TARGET_OBJECTS:tests>)
+add_test(einstein_wurfelt_nicht_test einstein_wurfelt_nicht_test)
+
 add_executable(euchre_test euchre/euchre_test.cc ${OPEN_SPIEL_OBJECTS}
                $<TARGET_OBJECTS:tests>)
 add_test(euchre_test euchre_test)