Added 'CONTENT-LICENSE.txt' with info about game asset licensing

diff --git a/CONTENT-LICENSE.txt b/CONTENT-LICENSE.txt
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+All game assets and demo data (should all be in "Data" folder 
+in the root of the source tree) are not under the same license 
+as the engine code. Wolfire has allowed the data to be freely redistributed
+for non commercial purposes, but it is forbidden to use in any revenue
+generating works.