Add libcurl files

other/curl/include/README.md

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+<!--
+Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+
+SPDX-License-Identifier: curl
+-->
+
+# include
+
+Public include files for libcurl, external users.
+
+They're all placed in the curl subdirectory here for better fit in any kind of
+environment. You must include files from here using...
+
+    #include <curl/curl.h>
+
+... style and point the compiler's include path to the directory holding the
+curl subdirectory. It makes it more likely to survive future modifications.
+
+The public curl include files can be shared freely between different platforms
+and different architectures.