Add Color Theme Setting to docs

docs/get-started/settings.md

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+# Color Themes
+
+Color themes let you modify the colors in Lens user interface to suit your preferences and work environment.
+
+In Lens, open the Preferences with **File** > **Preferences**. (**Code** > **Preferences** on macOS) and select your preferred theme from the **Color Theme** dropdown. 
+![Color Theme](images/color-theme.png)