Feature backtrack (#28)

* init

* v2.1.7 backdated transaction

Author: brucewzj99

README.md

@@ -68,6 +68,8 @@ python3.9 test.py
 
 /addincome - Add Income Entry
 
+/backlog - Add backdated transaction
+
 /getdaytransaction - Retrieve transaction from dates
 
 /getoverall - Retrieve overall transaction for a month

bot/common.py

@@ -32,4 +32,6 @@ class ConversationState(Enum):
         INCOME,
         WORK_PLACE,
         CPF,
-    ) = range(24)
+        BACKLOG,
+        ADD_BACKLOG_ENTRY,
+    ) = range(26)