added lights

Project/Assets/ML-Agents/Examples/SharedAssets/Materials/AgentBlue.mat

 Material:
   serializedVersion: 6
   m_ObjectHideFlags: 0
-  m_PrefabParentObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
   m_Name: AgentBlue
   m_Shader: {fileID: 47, guid: 0000000000000000f000000000000000, type: 0}
   m_ShaderKeywords: _GLOSSYREFLECTIONS_OFF _SPECULARHIGHLIGHTS_OFF

Project/Assets/ML-Agents/Examples/SharedAssets/Materials/Checkers_Ball.mat

 Material:
   serializedVersion: 6
   m_ObjectHideFlags: 0
-  m_PrefabParentObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
   m_Name: Checkers_Ball
   m_Shader: {fileID: 47, guid: 0000000000000000f000000000000000, type: 0}
   m_ShaderKeywords: _GLOSSYREFLECTIONS_OFF _SPECULARHIGHLIGHTS_OFF
         m_Offset: {x: 0, y: 0}
     - _EmissionMap:
         m_Texture: {fileID: 0}
-        m_Scale: {x: 2, y: 1}
+        m_Scale: {x: 3, y: 1}
-        m_Scale: {x: 2, y: 1}
+        m_Scale: {x: 3, y: 1}
         m_Offset: {x: 0, y: 0}
     - _MetallicGlossMap:
         m_Texture: {fileID: 0}

Project/Assets/ML-Agents/Examples/SharedAssets/Materials/GreenEmissive.mat

     - _ZWrite: 1
     m_Colors:
     - _Color: {r: 0.5, g: 0.5, b: 0.5, a: 1}
-    - _EmissionColor: {r: 0.08525872, g: 1, b: 0, a: 1}
+    - _EmissionColor: {r: 1, g: 0.011764706, b: 0, a: 1}