Add vendor area

diff --git a/vendor/README.md b/vendor/README.md
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+This area is for 3rd party software we include directly.
+All imports should be made on a branch vendor/NAME (initially orphaned) and
+merged into the master branch.
+
+Any local changes we need (ideally none) should be done directly
+on the master branch where we handle any fallout.
+
+This makes updating vendor imports easy.
+
+Vendor sources are imported from these locations:
+* queue.h     - https://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys/queue.h
+* rbtree.c    - https://cvsweb.netbsd.org/bsdweb.cgi/src/common/lib/libc/gen/rbtree.c
+* rbtree.h    - https://cvsweb.netbsd.org/bsdweb.cgi/src/sys/sys/rbtree.h