[namespace-registry] add new namespace "<chan1>"

[thareUSGS]

• Namespace ID Requested: chan1
• Discipline or Mission LDD? a mission-specific dictionary
• Steward Organization Name: PDS GEO and PDS IMG
• LDD Steward Name: Susan Slavney and Trent Hare
• LDD Steward Email: susan.slavney@wustl.edu
• LDD Description: Chandrayaan-1 mission dictionary
• Rationale for creation of new LDD: The Chandrayaan-1 mission dictionary contains a class with attributes specific to the Chandrayaan-1 mission and instruments. This dictionary was created for the migration of Chandrayaan data products from PDS3 to PDS4.

[c-suh]

Updated pds-namespace-registry.pdf uploaded to the PDS site.