feat: adding zsh plugin

dolt.plugin.zsh

@@ -0,0 +1,13 @@
+if (( $+commands[dolt] )); then
+  # gen-zsh writes a file to the command line, and does not output the completion script like
+  # most other cli tools. For this reason, we write the file to the local directory and source it
+  local completion_path=${0:h}/_dolt
+
+  if [[ ! -e "$completion_path" ]]; then
+    # creates a completion file in the current directory
+    dolt gen-zsh --file="$completion_path"
+  fi
+
+  source "$completion_path"
+  compdef _dolt dolt
+fi