Added notes for experimental

NOTES

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+== Experimental ==
+
+This part of libburnia project (libburnia-project.org) subversion repository
+contains and will contain experimental implementations and new explorations
+of either libburnia project team members or outside contributors.
+
+It is merely intented as a playground where we can toy around with new libraries,
+applications, and other creations. Those toys that reach certain level of
+maturity will be subject of inclusion in the regular libburnia development and
+release process.