docs: Update README to explain contents origins

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 # Vulkan-Headers
 
 Vulkan Header files and API registry
+
+## Repository Content
+
+The contents of this repository are largely obtained from other repositories and are
+collected, coordinated, and curated here.
+
+The projects for these repositories are:
+
+- [KhronosGroup/Vulkan-Docs](https://github.com/KhronosGroup/Vulkan-Docs)
+  - Core Vulkan headers and Registry
+- [KhronosGroup/Vulkan-Hpp](https://github.com/KhronosGroup/Vulkan-Hpp)
+  - C++ Bindings for Vulkan
+
+Please visit the appropriate project in the above list for obtaining additional information,
+asking questions, or opening issues.