Added page for route under osx

pages/osx/route.md

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+# route
+
+> Manually manipulate the routing tables
+> Necessitates to be root.
+
+- add a route to a destination through a gateway
+
+`sudo route add 10.0.0.0/8 192.168.1.1`
+
+- run in test mode (does not do anything, just print)
+
+`sudo route -t add 112.1.124.12/32 192.168.1.1`
+
+- remove all routes
+
+`sudo route flush`
+
+- delete a specific route
+
+`sudo route delete 10.0.0.0/24`