README.md: Add TODO

Author: sangamcse

README.md

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+# myPNRStatus
+A script in python3 to check PNR status on your terminal
+
+```
+Enter your PNR: 8606850987
+
+*** You Queried For : PNR Number: 8606850987 ***
+Charting Status: No	No. of Passengers: 1
+
+  Train Number  Train Name      Boarding Date    From          To              Reserved Upto    Boarding Point    Class
+--------------  --------------  ---------------  ------------  --------------  ---------------  ----------------  -------
+         15635  DWARKA EXPRESS  10-08-2018       AHMEDABAD JN  NEW JALPAIGURI  NEW JALPAIGURI   VADODARA JN       3A
+
+  S. No.  Booking Status (Coach No , Berth No., Quota)    *Current Status (Coach No , Berth No.)
+--------  ----------------------------------------------  ----------------------------------------
+       0  RLWL/-/25/GN                                    RLWL/-/11/GN
+```
+
+## TODO
+
+- [x] Test with waiting tickets for single passenger.
+- [x] Test with waiting tickets for multi-passenger.
+- [ ] Test with confirmed tickets.