licenses/CLONK-trademark: Add license CLONK-trademark

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+Clonk Trademark License
+
+'Clonk' is a registered trademark of Matthes Bender. It may be used within
+software products which are using source code from the OpenClonk project
+with the following limitations:
+
+If the word 'Clonk' is used as the name of anything in your software product
+then you must include the following notice in a suitable place (e.g. credits
+screen): "Clonk" is a registered trademark of Matthes Bender.
+
+If the title of your software product contains the word 'Clonk' then you must
+prefix the word with an added name of your choosing, e.g. 'MyClonk' or
+'PortableClonk' and you must subtitle your project with the term 'An OpenClonk
+project'.
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