Centralise C++ Client installations instructions (#1656)

The installation instructions for the C++ client need adjusting -
hazelcast/hazelcast-cpp-client#1272

To save duplicating the fix, it's more maintainable to link to the
existing instructions and avoid duplication.

_(note - originally raised done in
hazelcast-guides/cpp-client-getting-started#4
but that repo should've been archived)_

Author: JackPGreen

docs/modules/clients/pages/cpp-client-getting-started.adoc

@@ -13,6 +13,7 @@ Before you begin, make sure you have the following:
 
 * C++ 11 or above
 * https://cloud.hazelcast.com/[Hazelcast {hazelcast-cloud} Account]
+* https://github.com/hazelcast/hazelcast-cpp-client#vcpkg-users[vcpkg and Hazelcast {cpp} client]
 * A text editor or IDE
 
 == Start a Hazelcast {hazelcast-cloud} Cluster
@@ -33,36 +34,6 @@ mkdir hazelcast-cpp-example
 cd hazelcast-cpp-example
 ----
 
-Download and install Vcpkg: +
-
-for Windows;
-[source,bash]
-----
-git clone https://github.com/microsoft/vcpkg
-.\vcpkg\bootstrap-vcpkg.bat
-----
-
-for non-Windows;
-[source,bash]
-----
-git clone https://github.com/microsoft/vcpkg
-./vcpkg/bootstrap-vcpkg.sh
-----
-
-Download and install hazelcast-cpp-client: +
-
-for Windows;
-[source,bash]
-----
-.\vcpkg\vcpkg.exe install "hazelcast-cpp-client[openssl]" --recurse
-----
-
-for non-Windows;
-[source,bash]
-----
-./vcpkg/vcpkg install "hazelcast-cpp-client[openssl]" --recurse
-----
-
 NOTE: Avoid directory names in your path that contain spaces or other non-standard characters.
 
 Extract the keystore files you downloaded into this directory. The files you need for this tutorial are: