feat: add fish theme (#18)

extras/fish/README.md

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+## Usage
+
+### Install
+
+1. Place the `cyberdream.theme` under `~/.config/fish/themes/`
+
+2. Run command to set the theme:
+
+```bash
+fish_config theme save cyberdream
+```

extras/fish/cyberdream.theme

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+# name: 'cyberdream'
+# url: 'https://github.com/scottmckendry/cyberdream.nvim'
+# preferred_background: 16181A
+
+fish_color_normal ffffff
+fish_color_command 52cfff
+fish_color_param f2cdcd
+fish_color_keyword 5eff6c
+fish_color_quote f1ff5e
+fish_color_redirection 5ea1ff
+fish_color_end bd5eff
+fish_color_comment 7f849c
+fish_color_error ff6e5e
+fish_color_gray 6c7086
+fish_color_selection --background=3c4048
+fish_color_search_match --background=3c4048
+fish_color_option f1ff5e
+fish_color_operator 5ea1ff
+fish_color_escape eba0ac
+fish_color_autosuggestion 6c7086
+fish_color_cancel ff6e5e
+fish_color_cwd f9e2af
+fish_color_user 94e2d5
+fish_color_host 5eff6c
+fish_color_host_remote f1ff5e
+fish_color_status ff6e5e
+fish_pager_color_progress 6c7086
+fish_pager_color_prefix 5ea1ff
+fish_pager_color_completion ffffff
+fish_pager_color_description 6c7086