Update README.md

README.md

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 # JL's Unity Blend Modes
 Collection of Unity shaders that support blend modes like photoshop layer style (Darken, Multiply, Linear Burn, etc)
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+Each shader applies given texture from sprite renderer to the texture from Unity's GrabPass, emulaitng the blend effect of photoshop layers.
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+![alt text](https://raw.githubusercontent.com/penandlim/JL-s-Unity-Blend-Modes/master/preview.png "Preview")
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+The texture assigned to sprite renderer **must have same dimensions/ratio as Screen width and height.**
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+Built for screen space effect but feel free to modify it by replacing GrabPass to other textures.
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+You can also use Stencil properties to limit the overlay effect to certain objects in the scene.
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+# Usage
+1. Add a UI Canvas to your project.
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+2. Add a sprite renderer as a child
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+3. Add an image with desired colors/opacity/gradient.
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+4. Add a material with a shader thats in "Blendmodes/" category
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+5. Adjust tint and opacity of the blend layer accordingly.