Add QuickStart with homebrew

Closes GH-116.

Author: WyriHaximus

install/macos/packages.xml

@@ -13,7 +13,24 @@
    version of PHP with the features you need.
   </simpara>
   <simpara>
-   The following resources offer easy to install packages and 
+   The quickest way to install php on macOS is with homebrew:
+  </simpara>
+  <para>
+   <orderedlist>
+    <listitem>
+     <para>
+      install homebrew, by following the instructions at <link xlink:href="https://brew.sh/">brew.sh</link>
+     </para>
+    </listitem>
+    <listitem>
+     <simpara>
+      brew install php
+     </simpara>
+    </listitem>
+   </orderedlist>
+  </para>
+  <simpara>
+   The following alternative resources also offer easy to install packages and
    precompiled binaries for PHP on Mac OS:
   </simpara>
   <para>
@@ -36,12 +53,6 @@
       <link xlink:href="&url.mac.fink;">&url.mac.fink;</link>
      </simpara>
     </listitem>
-    <listitem>
-     <simpara>
-      Homebrew: 
-      <link xlink:href="&url.mac.homebrew;">&url.mac.homebrew;</link>
-     </simpara>
-    </listitem>
    </itemizedlist>
   </para>
  </sect1>