Adding SensitiveContent Plugin for nsfw filtering

plugins/SensitiveContent/README.md

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+# "Sensitive" Content Plugin for GNU Social
+
+## About
+
+WARNING: THIS IS ALPHA CODE, IT IS PRERELEASE AND SHOULD ONLY BE INSTALLED TO
+HELP TEST OR YOU ARE WILLING TO TAKE RISKS.
+
+Create user option to allow a user to hide #NSFW-hashtagged notices behind a
+blocker image until clicked.
+
+Works for both vanilla GNUSocial and with the Qvitter plugin.
+
+## Install
+
+- Move the project directory to ${GNU_SOCIAL}/plugins
+- Add addPlugin('SensitiveContent'); to your config.php
+
+if you want to customize the blocker image, add a line to your config.php:
+
+  $config['site']['sensitivecontent']['blockerimage'] = "/path/to/image.jpg";
+
+## Usage
+
+Individual users must go to their Settings page. A new sidebar menu item "Sensitive Content"
+will be available. User checks or unchecks the checkbox on this page, and presses save.
+
+
+If you have GNU Social open in other browser tabs, refresh them. If you are using Qvitter, also
+refresh, but because Qvitter caches notices on the client side, only new sensitive images will
+be hidden, it will not apply to notices retroactively unless you clear your browser cache.
+
+## License
+
+GNU Affero License
+
+## Thanks
+
+Thanks in particular to Hannes and Qvitter because looking at his code helped me a lot.
+
+A tiny bit of content was taken from Qvitter to enhance Qvitter with this functionality.
+