added code for interacting with database

database.py

@@ -0,0 +1,7 @@
+from pymongo import MongoClient
+
+def connect(ip_addr: str = '192.168.1.2', db_name: str = 'twitter', collection_name: str = 'tweet'):
+    client = MongoClient(ip_addr)
+    db = client[db_name]
+    collection = db[collection_name]
+    return collection