Add project files.

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

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+Long: speed-limit
+Short: Y
+Arg: <speed>
+Help: Stop transfers slower than this
+---
+If a download is slower than this given speed (in bytes per second) for
+speed-time seconds it gets aborted. speed-time is set with --speed-time and is
+30 if not set.
+
+If this option is used several times, the last one will be used.