Update README.md

package/Runtime/ExternalContent/README.md

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-# External Content
-Not all content needs to be packaged in the main build and loaded right at the start.
-Downloading and spawning content on demand is a good practice to lower the initial load time.
-
-## URL parameters
-This sample also showcases how to read and set URL parameters. Your URL can contain a link to remote assets like so:
-`?model={URL}`
-
-Concrete example would be like so:
-https://engine.needle.tools/samples-uploads/dynamic-content/?model=https%3A%2F%2Fraw.githubusercontent.com%2FKhronosGroup%2FglTF-Sample-Models%2Fmaster%2F2.0%2FDamagedHelmet%2FglTF-Embedded%2FDamagedHelmet.gltf
-
-The inner URLs should be encoded, you can read more [here](<https://www.w3schools.com/tags/ref_urlencode.ASP>).
+# External Content   
+This scene shows examples of how to load 3D models, textures or images from external URLs.