[feature] Add common shells completions (#44)

completion/smug.bash

@@ -0,0 +1,8 @@
+_smug_list_projects () {
+  if [ "${#COMP_WORDS[@]}" != "2" ]; then
+    return
+  fi
+  COMPREPLY=($(ls ~/.config/smug | grep -v "smug\.log" | sed -e 's/\..*//'))
+}
+
+complete -F _smug_list_projects smug

completion/smug.fish

@@ -0,0 +1 @@
+complete -x -c smug -a "(ls ~/.config/smug | grep -v \"smug\.log\" | sed -e 's/\..*//')"