Update Chatbot-UI.md

Added a small line to find the package.json

Author: amolwankhede

src/Plugins/BotSharp.Plugin.ChatbotUI/Chatbot-UI.md

@@ -3,6 +3,7 @@
 
 ```shell
 git clone https://github.com/mckaywrigley/chatbot-ui
+cd chatbot-ui (change dir to chatbot-ui to find the package.json)
 npm i
 npm run dev
 ```