Added README to theme

themes/coffeeandcode/README.md

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+# Fish Theme: coffeeandcode
+
+Another theme choice for Oh-My-Fish! originally created by
+[Jonathan Knapp](http://jonknapp.com).
+
+### Warning:
+
+This theme will overwrite all of your Fish color and git settings. If you'd like
+to customize them, you will have to make changes to the `fish_prompt.fish` file
+in this theme. All of the settings are listed at the top of the file.