[curlcpp] Add curlcpp port

[troyan1337]

• Changes comply with the maintainer guide.
• The name of the port matches an existing name for this component on https://repology.org/ if possible, and/or is strongly associated with that component on search engines.
• Optional dependencies are resolved in exactly one way. For example, if the component is built with CMake, all find_package calls are REQUIRED, are satisfied by vcpkg.json's declared dependencies, or disabled with CMAKE_DISABLE_FIND_PACKAGE_Xxx.
• The versioning scheme in vcpkg.json matches what upstream says.
• The license declaration in vcpkg.json matches what upstream says.
• The installed as the "copyright" file matches what upstream says.
• The source code of the component installed comes from an authoritative source.
• The generated "usage text" is accurate. See adding-usage for context.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is in the new port's versions file.
• Only one version is added to each modified port's versions file.

[troyan1337]

@microsoft-github-policy-service agree

[dg0yt]

OMG, JosephP91/curlcpp#154 and no action yet. Do we really want this port?

At least trim the change to a single line:

-    add_library(curlcpp ${BUILD_SHARED_LIBS}
+    add_library(curlcpp SHARED

(plus context)

[LilyWangLL]

Usage passed on x64-windows.