Included todo sample app in pnpm workspaces if...

...using pnpm to install it instead of yarn.

Steps to install and build the sample using pnpm:

1. Go to dexie root
2. pnpm install -r
3. pnpm build
4. pnpm run -r build
5. cd samples/dexie-cloud-todo-app
6. ./configure-app.sh
7. pnpm start

Author: dfahlander