To get started run

git clone https://github.com/ostreifel/Attachments-Group.git
cd Attachments-Group
npm install -g typings tfx-cli
npm install
npm run package-dev

To test the extension:

• change the publisher in vss-extension.json to your publisher id
• upload the dev version to the marketplace on your publisher account
• share the private extension with the your account so it can be installed
• go to the account that the extension was shared with to complete the installation