Please save the above xml contents of my Excel Office add-in manifest as manifest.xml. If you insert the add-in using the manifest file the add-in gets installed from the add-in files from my github repository. I want to embed this manifest.xml into Open office xml. So, when I send my work sample to my client the client will open the document from my onedrive and automatically load the add-in. So the client can use my add-in and tell me if any changes to be done for the add-in.