added simple_crossing scenario

marl_factory_grid/configs/simple_crossing.yaml

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+General:
+  # Your Seed
+  env_seed: 69
+  # Individual vs global rewards
+  individual_rewards: true
+  level_name: simple_crossing
+  # View Radius; 0 = full observatbility
+  pomdp_r: 0
+  verbose: true
+  tests: false
+
+Agents:
+  Agent_horizontal:
+    Actions:
+      - Noop
+      - Move8
+    Observations:
+      - Walls
+      - Other
+      - Destination
+    # Avaiable Spawn Positions as list
+    Positions:
+      - (1,2)
+    # It is okay to collide with other agents, so that
+    #   they end up on the same position
+    is_blocking_pos: true
+  Agent_vertical:
+    Actions:
+      - Noop
+      - Move8
+    Observations:
+      - Walls
+      - Other
+      - Destination
+    Positions:
+      - (2,1)
+    is_blocking_pos: true
+
+# Other noteworthy Entitites
+Entities:
+  Destinations:
+    # Let them spawn on closed doors and agent positions
+    ignore_blocking: true
+    spawnrule:
+      SpawnDestinationsPerAgent:
+        coords_or_quantity:
+          Agent_horizontal:
+            - (3,2)
+          Agent_vertical:
+            - (2,3)
+    # Whether you want to provide a numeric Position observation.
+    # GlobalPositions:
+    #   normalized: false
+
+# Define the env. dynamics
+Rules:
+  # Utilities
+  #  This rule Checks for Collision, also it assigns the (negative) reward
+  WatchCollisions:
+    reward: -0.1
+    reward_at_done: -1
+    done_at_collisions: false
+  # Done Conditions
+  #   Load any of the rules, to check for done conditions.
+  DoneAtDestinationReach:
+    reward_at_done: 1
+    # We want to give rewards only, when all targets have been reached.
+    condition: "all"
+  DoneAtMaxStepsReached:
+    max_steps: 200

marl_factory_grid/levels/simple_crossing.txt

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+#####
+##-##
+#---#
+##-##
+#####