fd: Implement managed file descriptor support

Change-Id: I0c5c438aa2c31ae52e115951b3fb1e85df182fd1
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/fd/intf.cpp b/test/fd/intf.cpp
new file mode 100644
index 0000000..d4cc8c2
--- /dev/null
+++ b/test/fd/intf.cpp
@@ -0,0 +1,4 @@
+#include <stdplus/fd/intf.hpp>
+int main(int, char*[])
+{
+}