Add shaders

Sources/Shaders/SnowParticleSurfaceShaderOpaque.shader

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+Shader "GlobalSnow/Snow Particle Surface Shader Opaque" {
+Properties {
+	_MainTex ("Particle Texture", 2D) = "white" {}
+	_Cutoff ("Alpha cutoff", Float) = 0.01
+}
+
+Subshader {
+	Tags { "Queue"="Geometry" "IgnoreProjector"="True" "RenderType"="ParticleCutOut" }
+	ColorMask RGB
+	Cull Off ZWrite On
+
+		CGPROGRAM
+		#pragma surface surf Simple vertex:vert
+		#pragma target 3.0
+		#include "UnityCG.cginc"
+
+
+		sampler2D _MainTex;
+		fixed _Cutoff;
+
+		struct Input {
+			fixed4 color: COLOR;
+			float2 uv_MainTex;
+		};
+			
+		half4 LightingSimple(SurfaceOutput s, half3 lightDir, half atten) {
+			half4 c;
+			c.rgb = saturate(s.Albedo * _LightColor0.rgb * atten);
+			c.a = s.Alpha;
+			return c;
+		}
+
+		void vert(inout appdata_full v, out Input o) {
+			UNITY_INITIALIZE_OUTPUT(Input, o);
+			o.color = v.color;
+		}
+			
+		void surf(Input IN, inout SurfaceOutput o) {
+			fixed4 co = tex2D(_MainTex, IN.uv_MainTex);
+			clip (co.a * IN.color.a - _Cutoff);
+			o.Albedo = co.rgb;
+		}
+		ENDCG 
+}
+}