Add shaders

Sources/Shaders/GrayscaleEffect.shader

@@ -0,0 +1,36 @@
+Shader "Hidden/Grayscale Effect" {
+Properties {
+	_MainTex ("Base (RGB)", 2D) = "white" {}
+	_RampTex ("Base (RGB)", 2D) = "grayscaleRamp" {}
+}
+
+SubShader {
+	Pass {
+		ZTest Always Cull Off ZWrite Off
+				
+CGPROGRAM
+#pragma vertex vert_img
+#pragma fragment frag
+#include "UnityCG.cginc"
+
+uniform sampler2D _MainTex;
+uniform sampler2D _RampTex;
+uniform half _RampOffset;
+
+fixed4 frag (v2f_img i) : SV_Target
+{
+	fixed4 original = tex2D(_MainTex, i.uv);
+	fixed grayscale = Luminance(original.rgb);
+	half2 remap = half2 (grayscale + _RampOffset, .5);
+	fixed4 output = tex2D(_RampTex, remap);
+	output.a = original.a;
+	return output;
+}
+ENDCG
+
+	}
+}
+
+Fallback off
+
+}