Add project files.

3rd-party/curl-7.52.1/docs/cmdline-opts/referer.d

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+Long: referer
+Short: e
+Arg: <URL>
+Protocols: HTTP
+Help: Referer URL
+See-also: user-agent header
+---
+Sends the "Referrer Page" information to the HTTP server. This can also be set
+with the --header flag of course.  When used with --location you can append
+";auto" to the --referer URL to make curl automatically set the previous URL
+when it follows a Location: header. The \&";auto" string can be used alone,
+even if you don't set an initial --referer.
+
+If this option is used several times, the last one will be used.