restructure project with seperate app/ and notebooks/ sub directories

api/app/constants.py

@@ -0,0 +1,11 @@
+from pathlib import Path
+
+# Resolve data files relative to this package, independent of the working directory
+DATA_DIR = Path(__file__).resolve().parent / "data"
+
+DEFAULT_MUSEUM_DATA_SOURCE_URL = "https://en.wikipedia.org/wiki/List_of_most_visited_museums"
+WIKIPEDIA_REST_API_URL_PREFIX = "https://en.wikipedia.org/api/rest_v1/page/html"
+
+# csv file downloaded from https://simplemaps.com/data/world-cities
+RAW_POPULATION_DATA_FILE = DATA_DIR / "worldcities.csv"
+MUSEUM_DATA_FILE = DATA_DIR / "updated_museum_data.csv"