Add patterns-knowledge-graph

[jmmcd]

I've created a container: https://github.com/polifonia-project/patterns-knowledge-graph/

Containing two components:

• Output dataset: https://github.com/polifonia-project/patterns-knowledge-graph/tree/main/patterns-knowledge-graph-datasets
• Software: https://github.com/polifonia-project/patterns-knowledge-graph/tree/main/P2KG-Pipeline

The container and two components all have README with yaml annotations according to: https://github.com/polifonia-project/rulebook/blob/main/schema.md