Added Req.txt and resolved conflicts

[PranshuLakhotia]

Implemented the changes with respect to PR #14.
Added req.txt
Reverted back to the old port

Pls review it @gtheodoridis.
Thank You.

[PranshuLakhotia]

@gtheodoridis solved the issue #22 with the latest commit pls review.
Changes made:

1. Modified the DICOMParser class to use getattr() with default values.
2. Updated get_patient_info(), get_study_info(), and get_series_info() methods to handle missing attributes gracefully.
3. Enhanced test cases to verify parser behavior with potentially missing attributes.

Files changed:

• dicom_server/dicom_parser.py
• dicom_server/test_dicom_parser.py

Testing:

• All existing tests pass
• New tests added to verify handling of missing attributes

Here is the ss of the same

[PranshuLakhotia]

@gtheodoridis awaiting your response.
Thank You