Add default settings documentation

Author: Ahrotahn

docs/default_settings.md

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+# Default Settings
+
+Vanilla Chromium settings are not often changed by ungoogled-chromium, however there are some exceptions.  
+Below is a list of the documented changes to the default Chromium settings.
+
+Setting | New State | Location
+-- | -- | --
+Allow sites to check if you have payment methods saved | Disabled | chrome://settings/payments
+Ask where to save each file before downloading | Enabled | chrome://settings/downloads
+Auto sign-in | Disabled | chrome://settings/passwords
+Block third-party cookies | Enabled | chrome://settings/cookies
+Clear cookies and site data when you close all windows | Enabled | chrome://settings/cookies
+Continue running background apps when Chromium is closed | Disabled | chrome://settings/system
+Hyperlink auditing (\<a ping>) | Disabled | NA
+Link Doctor | Disabled | NA
+Offer to save passwords | Disabled | chrome://settings/passwords
+Payment autofill | Disabled | chrome://settings/payments
+Preload pages | Disabled | chrome://settings/cookies
+Search suggestions | Disabled | chrome://settings/syncSetup
+Show bookmark bar | Enabled | chrome://settings/appearance
+WebRTC IP handling policy | Disable Non-Proxied UDP | `--webrtc-ip-handling-policy`