pydggsapi sample configuration

A sample configuration file for pydggsapi for IGEO7-indexed datasets, converted from the sample collection. To use the sample file, the data source file paths need to be updated. Example to use with the pydggsapi Docker image : Pull the Docker image with `docker pull ghcr.io/landscapegeoinformatics/pydggsapi:latest` Download the sample configuration to the local directory. Rename the file to `pydggsapi-config.json` Update data source file paths inside the pydggsapi-config.json Run the Docker with volume mount option `-v :/opt/local/src/pydggsapi/config`