wrote database manager module

core/database.py

@@ -0,0 +1,33 @@
+import json 
+import os
+
+class Database:
+    def __init__(self, filepath="passwords.json"):
+
+        self.filepath = filepath
+
+        if not os.path.exists(self.filepath):
+            with open(self.filepath, 'w') as db:
+                json.dump([], db)
+
+    def read_data(self):
+        with open(self.filepath, 'r') as db:
+            return json.load(db)
+
+    def write_data(self,data):
+        with open(self.filepath, 'w') as db:
+            json.dump(data, db, indent=4)
+
+    def add_password(self, service, userid, encrypted_password):
+        data = self.read_data()
+        entry = {
+            "service": service,
+            "userid": userid,
+            "encrypted_password": encrypted_password
+        }
+
+        data.append(entry)
+        self.write_data(data)
+
+    def get_passwords(self):
+        return self.read_data()