Remove useless files, add hands

Assets/Oculus/SampleFramework/Usage/HandsTrainExample/Shaders/GradientSkybox.shader

@@ -1,81 +0,0 @@
-/************************************************************************************
-
-Copyright (c) Facebook Technologies, LLC and its affiliates. All rights reserved.  
-
-See SampleFramework license.txt for license terms.  Unless required by applicable law 
-or agreed to in writing, the sample code is provided “AS IS” WITHOUT WARRANTIES OR 
-CONDITIONS OF ANY KIND, either express or implied.  See the license for specific 
-language governing permissions and limitations under the license.
-
-************************************************************************************/
-
-Shader "Oculus Sample/Procedural Gradient Skybox"
-{
-  Properties
-  {
-    _TopColor ("Top Color", Color) = (1, 1, 1, 0)
-    _HorizonColor ("Horizon Color", Color) = (1, 1, 1, 0)
-    _BottomColor ("Bottom Color", Color) = (1, 1, 1, 0)
-    _TopExponent ("Top Exponent", Float) = 0.5
-    _BottomExponent ("Bottom Exponent", Float) = 0.5
-    _AmplFactor ("Amplification", Float) = 1.0
-  }
-  SubShader
-  {
-    Tags{"RenderType" ="Background" "Queue" = "Background"}
-    ZWrite Off Cull Off 
-    Fog { Mode Off }
-    LOD 100
-
-    Pass
-    {
-      CGPROGRAM
-      #pragma vertex vert
-      #pragma fragment frag
-    
-      #include "UnityCG.cginc"
-
-      struct vertIn
-      {
-        float4 vertex : POSITION;
-        float3 uv : TEXCOORD0;
-      };
-
-      struct vertOut
-      {
-        float4 vertex : SV_POSITION;
-        float3 uv: TEXCOORD0;
-      };
-      
-      vertOut vert (vertIn v)
-      {
-        vertOut o;
-        o.vertex = UnityObjectToClipPos(v.vertex);
-        o.uv = v.uv;
-        return o;
-      }
-
-      half _TopExponent;
-      half _BottomExponent;
-      fixed4 _TopColor;
-      fixed4 _HorizonColor;
-      fixed4 _BottomColor;
-      half _AmplFactor;
-      
-      fixed4 frag (vertOut i) : SV_Target
-      {
-        float interpUv = normalize (i.uv).y;
-        // top goes from 0->1 going down toward horizon
-        float topLerp = 1.0f - pow (min (1.0f, 1.0f - interpUv), _TopExponent);
-        // bottom goes from 0->1 going up toward horizon
-        float bottomLerp = 1.0f - pow (min (1.0f, 1.0f + interpUv), _BottomExponent);
-        // last lerp param is horizon. all must add up to 1.0
-        float horizonLerp = 1.0f - topLerp - bottomLerp;
-        return (_TopColor * topLerp + _HorizonColor * horizonLerp + _BottomColor * bottomLerp) *
-          _AmplFactor;
-      }
-
-      ENDCG
-    }
-  }
-}