Add an initial version of externals-ng documentation.
Add an initial version of externals-ng documentation.

Feel free to edit, extend, rephrase, ask questions in the file, etc. etc.

* subversion/notes/wc-ng/externals
  (new file)

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1102654 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion