Draft: Add copyright.yml
license-scan job reported the below error,
ERROR:
UNKNOWN license entry found: CopyrightEntry(file='*', license='UNKNOWN')
UNKNOWN license entry found: CopyrightEntry(file='DISCLAIMER', license='UNKNOWN')
UNKNOWN license entry found: CopyrightEntry(file='strcasecmp.c', license='UNKNOWN')
The license of the project is 'TCP Wrappers License' and strcasecmp.c license is BSD-4-Clause-UC.
Manually provide the correct copyright information to fix this error
Edited by Vignesh Raman