add WalkerDynamicVarialbeSpeed scene and update prefabs

Project/Assets/ML-Agents/Examples/Walker/Prefabs/DynamicPlatformWalker.prefab

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Project/Assets/ML-Agents/Examples/Walker/Prefabs/WalkerRagdoll.prefab

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Project/Assets/ML-Agents/Examples/Walker/Scripts/WalkerAgent.cs

 {
     [Header("Walk Speed")] [Range(0, 15)] public float walkingSpeed = 15; //The walking speed to try and achieve
     float m_maxWalkingSpeed = 15; //The max walking speed
+    
+    //Should the agent sample a new goal velocity each episode?
+    //If true, walkSpeed will be randomly set between zero and m_maxWalkingSpeed in OnEpisodeBegin() 
+    //If false, the goal velocity will be walkingSpeed
     public bool randomizeWalkSpeedEachEpisode;
     Vector3 m_WalkDir; //Direction to the target
 
 
         rewardManager.ResetEpisodeRewards();
 
+        //Set our goal walking speed
-            randomizeWalkSpeedEachEpisode ? Random.Range(0.0f, m_maxWalkingSpeed) : walkingSpeed; //Random Walk Speed
+            randomizeWalkSpeedEachEpisode ? Random.Range(0.0f, m_maxWalkingSpeed) : walkingSpeed;
 
         SetResetParameters();
     }

Project/Assets/ML-Agents/Examples/SharedAssets/Prefabs/PlatformDynamicTarget.prefab

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