Add macOS installer Conclusion file

Mac/BuildScript/resources/Conclusion.rtf

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+\f3\fnil\fcharset0 Monaco;}
+{\colortbl;\red255\green255\blue255;}
+{\*\expandedcolortbl;;}
+\margl1440\margr1440\vieww10540\viewh8400\viewkind0
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+
+\f0\fs28 \cf0 Congratulations!
+\fs24   
+\f1\b\fs28 Python $FULL_VERSION for macOS $MACOSX_DEPLOYMENT_TARGET
+\f2\b0  was successfully installed.
+\fs24 \
+\
+One more thing: to verify the identity of secure network connections, this Python needs a set of SSL root certificates.  You can download and install a current curated set from {\field{\*\fldinst{HYPERLINK "https://pypi.org/project/certifi/"}}{\fldrslt the Certifi project}} by double-clicking on the 
+\f3 Install Certificates
+\f2  icon in {\field{\*\fldinst{HYPERLINK "file://localhost/Applications/Python%20$VERSION/"}}{\fldrslt the Finder window}}.  See {\field{\*\fldinst{HYPERLINK "file://localhost/Applications/Python%20$VERSION/ReadMe.rtf"}}{\fldrslt the 
+\f3 ReadMe
+\f2  file}} for more information.\
+}
\ No newline at end of file