added floorhit obs tennis

Project/Assets/ML-Agents/Examples/Tennis/Prefabs/TennisArea.prefab

   m_Name: 
   m_EditorClassIdentifier: 
   m_BrainParameters:
-    vectorObservationSize: 9
+    vectorObservationSize: 10
     numStackedVectorObservations: 3
     vectorActionSize: 03000000
     vectorActionDescriptions: []
   m_Name: 
   m_EditorClassIdentifier: 
   m_BrainParameters:
-    vectorObservationSize: 9
+    vectorObservationSize: 10
     numStackedVectorObservations: 3
     vectorActionSize: 03000000
     vectorActionDescriptions: []

Project/Assets/ML-Agents/Examples/Tennis/Scripts/HitWall.cs

             FloorAHit,
             FloorBHit
         }
-
-    FloorHit m_LastFloorHit;
+    [HideInInspector]
+    public FloorHit LastFloorHit;
 
     TennisArea m_Area;
     TennisAgent m_AgentA;
 
     public void ResetPoint()
     {
-        m_LastFloorHit = FloorHit.Service;
+        LastFloorHit = FloorHit.Service;
         m_LastAgentHit = -1;
     }
 
             if (collision.gameObject.name == "wallA")
             {
                 // Agent A hits into wall or agent B hit a winner
-                if (m_LastAgentHit == 0 || m_LastFloorHit == FloorHit.FloorAHit)
+                if (m_LastAgentHit == 0 || LastFloorHit == FloorHit.FloorAHit)
                 {
                     AgentBWins();
                 }
             else if (collision.gameObject.name == "wallB")
             {
                 // Agent B hits into wall or agent A hit a winner
-                if (m_LastAgentHit == 1 || m_LastFloorHit == FloorHit.FloorBHit)
+                if (m_LastAgentHit == 1 || LastFloorHit == FloorHit.FloorBHit)
                 {
                     AgentAWins();
                 }
             else if (collision.gameObject.name == "floorA")
             {
                 // Agent A hits into floor, double bounce or service
-                if (m_LastAgentHit == 0 || m_LastFloorHit == FloorHit.FloorAHit || m_LastFloorHit == FloorHit.Service)
+                if (m_LastAgentHit == 0 || LastFloorHit == FloorHit.FloorAHit || LastFloorHit == FloorHit.Service)
-                    m_LastFloorHit = FloorHit.FloorAHit;
+                    LastFloorHit = FloorHit.FloorAHit;
-                if (m_LastAgentHit == 1 || m_LastFloorHit == FloorHit.FloorBHit || m_LastFloorHit == FloorHit.Service)
+                if (m_LastAgentHit == 1 || LastFloorHit == FloorHit.FloorBHit || LastFloorHit == FloorHit.Service)
-                    m_LastFloorHit = FloorHit.FloorBHit;
+                    LastFloorHit = FloorHit.FloorBHit;
                 }
             }
         }
             {
 
                 m_LastAgentHit = 0;
-                m_LastFloorHit = FloorHit.FloorHitUnset;
+                LastFloorHit = FloorHit.FloorHitUnset;
             }
         }
         else if (collision.gameObject.name == "AgentB")
             else
             {
                 m_LastAgentHit = 1;
-                m_LastFloorHit = FloorHit.FloorHitUnset;
+                LastFloorHit = FloorHit.FloorHitUnset;
             }
         }
     }

Project/Assets/ML-Agents/Examples/Tennis/Scripts/TennisAgent.cs

     Text m_TextComponent;
     Rigidbody m_AgentRb;
     Rigidbody m_BallRb;
+    HitWall m_BallScript;
     TennisArea m_Area;
     float m_InvertMult;
     FloatPropertiesChannel m_ResetParams;
     {
         m_AgentRb = GetComponent<Rigidbody>();
         m_BallRb = ball.GetComponent<Rigidbody>();
+        m_BallScript = ball.GetComponent<HitWall>();
         m_Area = myArea.GetComponent<TennisArea>();
         var canvas = GameObject.Find(k_CanvasName);
         GameObject scoreBoard;
         sensor.AddObservation(m_BallRb.velocity.y);
 
         sensor.AddObservation(m_InvertMult * gameObject.transform.rotation.z);
+        if (m_BallScript.LastFloorHit == HitWall.FloorHit.FloorHitUnset)
+        {
+            sensor.AddObservation(1.0f);
+        }
+        else
+        {
+            sensor.AddObservation(0.0f);
+        }
     }
 
     public override void OnActionReceived(float[] vectorAction)