initial sources for vcpkg support

contrib/vcpkg/readme.md

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+# Vcpkg support
+
+This directory is meant to provide the sources for the official [vcpkg port] 
+of mimalloc, but can also be used to override the official port with
+your own variant.
+
+For example, you can edit the [`portfile.cmake`](portfile.cmake) 
+to check out a specific commit, version, or branch of mimalloc, or set further options. 
+You can install such custom port as:
+```sh
+$ vcpkg install mimalloc --overlay-ports=./contrib/vcpkg
+```
+
+This will also show the correct sha512 hash if you use a custom version.
+See the vcpkg [documentation](https://learn.microsoft.com/en-us/vcpkg/produce/update-package-version) for more information.
+
+
+# Using mimalloc from vcpkg
+
+When using [cmake with vcpkg](https://learn.microsoft.com/en-us/vcpkg/get_started/get-started?pivots=shell-powershell), 
+you can use mimalloc from the `CMakeLists.txt` as:
+
+```cmake
+find_package(mimalloc CONFIG REQUIRED)
+target_link_libraries(main PRIVATE mimalloc)
+```
+
+
+# Acknowledgements
+
+The original port for vckpg was contributed by various people, including: @vicroms, @myd7349, @PhoubeHui, @LilyWangL,
+@JonLiu1993, @RT2Code, Remy Tassoux, @wangao, @BillyONeal, @jiayuehua, @dg0yt, @gerar-ryan-immersaview, @nickdademo, 
+and @jimwang118 -- Thank you so much!
+
+
+[vcpkg port]: https://github.com/microsoft/vcpkg/tree/master/ports/mimalloc