Initial clean commit

models/categorias.py

@@ -0,0 +1,9 @@
+from psycopg2 import extras
+from typing import List, Dict
+
+
+def get_categorias(conn) -> List[Dict]:
+    with conn.cursor(cursor_factory=extras.DictCursor) as cur:
+        cur.execute("SELECT id, nombre FROM categorias ORDER BY nombre;")
+        return cur.fetchall()
+