Main steps: 
1. Clone project: git clone https://code.rizlum.com/Tu/Outlook_Addin_LLM.git and go to this directory
2. Run npm install
3. Run npm start to run file manifest.xml 
4. Make sure that it is possible to access http://localhost:3000/ . If necessary, install ngrok and run "ngrok http 3000" on terminal
5. Add add-in on outlook via manifest.xml file from https://aka.ms/olksideload 
6. Check the add-in outlook named "Outlook LLM"