Initialize es-metadata.yml for inventory

Please add a file named `es-metadata.yml` to the root of this repository with the following contents:

```
schemaVersion: 0.0.1
isProduction: false
accountableOwners:
  service: 7a9b52f6-7805-416c-9390-343168c0cdb3
routing:
  defaultAreaPath:
    org: devdiv
    path: DevDiv\NET Libraries
```

This file will help initialize inventory metadata for the repository.