macOS: add a README file

Add a README file containing some notes about building FreeRDP on macOS related to openssl.
advcsi · Sep 23, 2017 · fe36cd9 · fe36cd9
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+Starting with "El Capitan" Apple removed the openssl headers. Therefore it's
+required to build openssl manually upfront. For example by using MacPorts or Homebrew.
+To build FreeRDP against this library it's required to set the PKG_CONFIG_PATH
+pointing to the openssl root directory befor building.
+For example with brew it would look like this:
+
+export PKG_CONFIG_PATH=$(brew --prefix)/opt/openssl/lib/pkgconfig