Add project files.

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

@@ -0,0 +1,8 @@
+Long: stderr
+Help: Where to redirect stderr
+See-also: verbose silent
+---
+Redirect all writes to stderr to the specified file instead. If the file name
+is a plain '-', it is instead written to stdout.
+
+If this option is used several times, the last one will be used.