docs: README update

default/inc_yuyv.glsl

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+#ifndef INC_YUYV
+#define INC_YUYV
+
+const int YUYV_FOURCC = 1448695129;
+
+const mat3x3 yuyv_to_rgb = {{1,1,1},{0,-0.39465,2.03211},{1.13983,-0.5806,0}};
+
+vec4 yuyvTex(sampler2D tex, vec2 vUV, int base_width) {
+    float w = base_width - 1;
+    
+    int x = int(vUV.x * w);
+
+    int xU = x - x % 2;
+    int xV = x - x % 2 + 1;
+
+    vec4 tU = texture(tex, vec2(xU / w, 1 - vUV.y));
+    vec4 tV = texture(tex, vec2(xV / w, 1 - vUV.y));
+
+    vec3 yuv = vec3(
+        x % 2 == 0 ? tU.x : tV.x,
+        tU.y - 0.5,
+        tV.y - 0.5
+    );
+
+    return vec4(yuyv_to_rgb * yuv, 1.0);
+}
+
+#endif