Add project files.

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

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+Short: C
+Long: continue-at
+Arg: <offset>
+Help: Resumed transfer offset
+See-also: range
+---
+Continue/Resume a previous file transfer at the given offset. The given offset
+is the exact number of bytes that will be skipped, counting from the beginning
+of the source file before it is transferred to the destination.  If used with
+uploads, the FTP server command SIZE will not be used by curl.
+
+Use "-C -" to tell curl to automatically find out where/how to resume the
+transfer. It then uses the given output/input files to figure that out.
+
+If this option is used several times, the last one will be used.