Add province boundary data for Vientiane

[yuiseki]

• Close: Add lib/data/optgeo.github.io/virgo-data/provinceboundary_cdudcp_v1.yaml #57

Adds a new YAML file for the province boundary data of Vientiane, Lao P. D. R. to the repository.

• File Addition: Introduces provinceboundary_cdudcp_v1.yaml under lib/data/optgeo.github.io/virgo-data/, containing essential metadata about the province boundary data.
• Metadata Details: Includes fields such as data_id, license, attributions, description, data_format, file_format, file_size, and url, with the license specified as "unknown" and a note about the data's open data intention.
• Attributions: Credits the Vientiane Integrated Urban Information GIS-based Opendata Platform with a link to their disclaimer page.
• Data Accessibility: Provides a URL pointing to the Shapefile's location, facilitating access to the province boundary data.

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