Add link to the new D3D12 Memory Allocator library

Author: adam-sawicki-a

README.md

@@ -110,6 +110,7 @@ See **[Documentation](https://gpuopen-librariesandsdks.github.io/VulkanMemoryAll
 
 # See also
 
+- **[D3D12 Memory Allocator](https://github.com/GPUOpen-LibrariesAndSDKs/D3D12MemoryAllocator)** - equivalent library for Direct3D 12. License: MIT.
 - **[Awesome Vulkan](https://github.com/vinjn/awesome-vulkan)** - a curated list of awesome Vulkan libraries, debuggers and resources.
 - **[PyVMA](https://github.com/realitix/pyvma)** - Python wrapper for this library. Author: Jean-Sébastien B. (@realitix). License: Apache 2.0.
 - **[vk-mem](https://github.com/gwihlidal/vk-mem-rs)** - Rust binding for this library. Author: Graham Wihlidal. License: Apache 2.0 or MIT.