adding custom folder for user specific functions and auto-sourced files

custom/example.fish

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+# Add yourself some shortcuts to projects you often work on
+# Example:
+#
+# set oh-my-fish /Users/bpinto/.oh-my-fish
+#

custom/plugins/example/example.fish

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+# Add your own custom plugins in the custom/plugins directory. Plugins placed
+# here will override ones with the same name in the main plugins directory.