update readme

README.md

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 # Better-Minimal-WebGL-Template
+
+Minimal WebGL build template.
+
+## Features
+
+- Scales canvas to fit the window horizontally + vertically while maintaining aspect ratio (can be disabled)
+- Centers canvas in window
+- Customizable background
+
+## To use
+
+1. Download and unzip
+2. Copy the `WebGLTemplates` folder into your project's `Assets` folder
+3. File -> Build Settings... -> WebGL -> Player Settings... -> Select the `BetterMinimal` template
+4. (Optional) Customize colour in the `Background` field; enter `false` in the `Scale to fit` field to disable scaling
+
+Ideal for embedding on sites like itch.io which provide an external full-screen button.