Add vcpkg support

Author: mborland

ports/decimal/b2-options.cmake

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+# Copyright 2024 Matt Borland
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+
+if(APPLE)
+    list(APPEND B2_OPTIONS cxxstd=14)
+endif()

ports/decimal/portfile.cmake

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+# Copyright 2024 Matt Borland
+# Distributed under the Boost Software License, Version 1.0.
+# https://www.boost.org/LICENSE_1_0.txt
+#
+# See: https://devblogs.microsoft.com/cppblog/registries-bring-your-own-libraries-to-vcpkg/
+
+vcpkg_from_github(
+        OUT_SOURCE_PATH SOURCE_PATH
+        REPO cppalliance/decimal
+        REF v1.0.0
+        SHA512 73043ea9514b747e519a5365ae57d9c1516d5f55784779d056d7db7266fd68328cd394e144db28125563c898b1d3acb6a4b47588ff319edefc84d35567a40b52
+        HEAD_REF master
+)
+
+file(COPY "${SOURCE_PATH}/include" DESTINATION "${CURRENT_PACKAGES_DIR}")
+file(COPY "${SOURCE_PATH}/LICENSE" DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}")

ports/decimal/vcpkg.json

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+{
+  "name": "decimal",
+  "version": "1.0.0",
+  "description": "A C++14 implementation of IEEE 754 decimal floating point numbers",
+  "homepage": "https://github.com/cppalliance/decimal",
+  "dependencies": [
+    {
+      "name": "boost-vcpkg-helpers",
+      "version>=": "1.81.0"
+    },
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    }
+    ]
+}