include MDAnalysis trademark

See MDAnalysis/mdanalysis-subprojects-branding#1 (comment)

Author: orbeckst

doc/source/_static/logos/LICENSE

@@ -6,6 +6,9 @@ Project, funded by a NumFOCUS Sustainable Development Grant (2023,
 Round 2).
 https://github.com/MDAnalysis/mdanalysis-subprojects-branding
 
+MDAnalysis™️ and the MDAnalysis logo are the sole property of NumFOCUS, Inc. 
+(registration pending).
+
 NumFOCUS https://numfocus.org/ as the fiscal sponsor of the MDAnalysis
 Project holds all rights for all logos in the `logos` directory.
 
@@ -21,4 +24,4 @@ For further information please contact NumFOCUS
   Austin, TX 78709
   info@numfocus.org
   +1 ​(512) 831-2870
-  
+