[Impeller] libImpeller: Tinker on the README to cross reference the SDK and the example.

impeller/README.md

@@ -229,6 +229,17 @@ To your `Info.plist` file, add under the top-level `<dict>` tag:
   <true/>
 ```
 
+## Embedding Standalone Impeller
+
+Impeller is designed to work best when used by Flutter. Most of the teams
+efforts go into being great at that use-case. But, standalone Impeller can be
+used to perform accelerated rendering in most environments without any Flutter
+dependencies.
+
+Impeller provides a standalone SDK. The SDK exposes a single-header C API with
+no platform dependencies. [Prebuilts for major platforms, documentation,
+examples, are available](toolkit/interop/README.md).
+
 ## Documentation, References, and Additional Reading
 
 * [Frequently Asked Questions](docs/faq.md)

impeller/toolkit/interop/README.md

@@ -63,6 +63,10 @@ The `$PLATFORM_ARCH` can be determined from the table below.
 
 For example, the SDK for `Linux x64` at engine SHA `31aaaaad868743b38ac3b7165f0d58eca94e521b` would be https://storage.googleapis.com/flutter_infra_release/flutter/31aaaaad868743b38ac3b7165f0d58eca94e521b/linux-x64/impeller_sdk.zip
 
+# Example
+
+A fully functional example of using Impeller to draw using GLFW is available in [`example.c`](example.c). This example is also present in the `impeller_sdk.zip` prebuilts along with necessary artifacts.
+
 # API Fundamentals
 
 ## Versioning