Add initial glossary terms

[davidnind]

Create an initial list of glossary terms and a master A - Z list.

[davidnind]

Koha terms:

• Koha

Free and open source software terms:

• GPL
• FLOSS
• free and open source software
• Git
• Bugs
• Bug tracker

Library terms:

• Issuing
• Call number
• Circulation
• Dewey
• Library of Congress subject headings
• USMARC
• MARC21
• Z39.50
• Authorities
• Course reserves