net/safe-search Add duckduckgo.com

Signed-off-by: Gregory L. Dietsche <gregory.dietsche@cuw.edu>

net/safe-search/Readme.md

@@ -2,18 +2,24 @@
 
 This package prevents adult content from appearing in search results by
 configuring dnsmasq to force all devices on your network to use Google and
-Bing's Safe Search IP addresses. This is designed to be approperiate for most
+Bing's Safe Search IP addresses. This is designed to be appropriate for most
 businesses and families. The default filtering rules do not interfere with
 normal web browsing.
 
-Currently supported:
-- Google Safe Search - enabled by default
-    - https://support.google.com/websearch/answer/186669
-- Bing Safe Search - enabled by default
-    -  https://help.bing.microsoft.com/#apex/18/en-US/10003/0
-- youtube Safe Search
-    - https://support.google.com/a/answer/6214622
-    - https://support.google.com/a/answer/6212415
-    - https://www.youtube.com/check_content_restrictions
-    - Not enabled by default because it is designed for children.
-    - Enable by editing /etc/config/safe-search and then run safe-search-update
+Enabled and disable Safe Search by editing /etc/config/safe-search . To make
+your changes active, run safe-search-update.
+
+Currently Supported:
+- Enabled By Default
+    - www.bing.com Safe Search
+        -  https://help.bing.microsoft.com/#apex/18/en-US/10003/0
+    - DuckDuckGo.com Safe Search
+        - https://duck.co/help/features/safe-search
+    - www.Google.com Safe Search
+        - https://support.google.com/websearch/answer/186669
+- Not Enabled By Default:
+    - youtube Safe Search
+        - https://support.google.com/a/answer/6214622
+        - https://support.google.com/a/answer/6212415
+        - https://www.youtube.com/check_content_restrictions
+        - Not enabled because it is designed for children, and may annoy adults...