Add fish shell completions

alacritty-completions.fish

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+# Meta
+complete -c alacritty \
+  -s "v" \
+  -l "version" \
+  -d "Prints version information"
+complete -c alacritty \
+  -s "h" \
+  -l "help" \
+  -d "Prints help information"
+
+# Config
+complete -c alacritty \
+  -l "live-config-reload" \
+  -d "Enable automatic config reloading"
+complete -c alacritty \
+  -l "no-live-config-reload" \
+  -d "Disable automatic config reloading"
+complete -c alacritty \
+  -f \
+  -l "config-file" \
+  -d "Specify an alternative config file"
+complete -c alacritty \
+  -l "title" \
+  -d "Defines the window title"
+complete -c alacritty \
+  -x \
+  -a '(__fish_complete_directories (commandline -ct))' \
+  -l "working-directory" \
+  -d "Start shell in specified directory"
+
+# Output
+complete \
+  -c alacritty \
+  -l "print-events" \
+  -d "Print all events to stdout"
+complete \
+  -c alacritty \
+  -s "q" \
+  -d "Reduces the level of verbosity (min is -qq)"
+complete \
+  -c alacritty \
+  -s "qq" \
+  -d "Reduces the level of verbosity"
+complete \
+  -c alacritty \
+  -s "v" \
+  -d "Increases the level of verbosity"
+complete \
+  -c alacritty \
+  -s "vv" \
+  -d "Increases the level of verbosity"
+complete \
+  -c alacritty \
+  -s "vvv" \
+  -d "Increases the level of verbosity"
+
+complete \
+  -c alacritty \
+  -l "ref-test" \
+  -d "Generates ref test"