Add project files.

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

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+Long: interface
+Arg: <name>
+Help: Use network INTERFACE (or address)
+See-also: dns-interface
+---
+
+Perform an operation using a specified interface. You can enter interface
+name, IP address or host name. An example could look like:
+
+ curl --interface eth0:1 https://www.example.com/
+
+If this option is used several times, the last one will be used.