Add task category, library name and tags

This PR adds the `task_categories` and `library_name` fields to the dataset card, sets the task category to `other`, and adds relevant tags. The github repository of the project is also added.

README.md

@@ -1,5 +1,12 @@
 ---
 license: apache-2.0
+task_categories:
+- other
+library_name: datasets
+tags:
+- poi-recommendation
+- recommendation
+- llm
 ---
 
 # LLM4POI