Add documentation for viewer warnings

docs/viewer_warning.md

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+## Viewer warnings
+
+The [Catalog web application](https://catalog.princeton.edu/) loads the viewer from [the web application Figgy](https://figgy.princeton.edu/). We currently use the [Universal viewer](https://github.com/UniversalViewer/universalviewer).  
+Using [the web application Figgy](https://figgy.princeton.edu/) a selector can update or create a new resource and set a value in the 'Notice type'. If a 'Notice type' value is set one of the following values, Harmful Content, Explicit content or Senior Thesis, a message will display instead of the viewer content.
+In order to view the content a user would have to press the button 'View Content' or 'Accept'.  
+
+### Notice type values and displayed message
+  * Notice type: Harmful Content,  
+    Displayed message:  
+    * Content Warning,  
+         This collection includes materials and images that are harmful (in that they are racist, transphobic, or otherwise demeaning). For more information on harmful content please see the [PUL statement on Harmful Content](https://library.princeton.edu/statement-harmful-content)  
+
+        View Content
+
+  * Notice type: Explicit content,  
+    Displayed message:   
+    * Content Warning,  
+         This collection includes materials and images that are explicit (in that they contain nudity and graphic content).
+
+        View Content
+
+  * Notice type: Senior Thesis,  
+    Displayed message:   
+    * Terms and Conditions for Using Princeton University Senior Theses,    
+         The Princeton University Senior Theses DataSpace community is a catalog of theses written by seniors at Princeton University from 1926 to the present. Senior theses submitted from 2014 forward contain a full-text PDF that is accessible only on the Princeton University network. Theses written prior to 2014 are available by visiting the Princeton University Archives at the Mudd Manuscript Library. [Email Mudd Manuscript Library](mailto:mudd@princeton.edu) with any questions.
+
+         Most theses are protected by copyright. The copyright law of the United States governs the making of photocopies or other reproductions of material under copyright. Under certain conditions specified in the law, libraries and archives are authorized to furnish a photocopy or other reproduction. These reproductions of copyrighted material must be for educational and/or research purposes consistent with "fair use" as defined by 17 U.S.C. 107. A photocopy or other reproduction provided by a library is not to be "used for any purpose other than private study, scholarship or research." If a user makes a request for, or later uses, a photocopy or other reproduction for purposes in excess of "fair use," that individual may be liable for copyright infringement.    
+
+        Accept
+
+
+