Add license details and give credit to more authors (based on git shortlog)

Change-Id: Iaa123a76e5dc52f44b3500e3add001581be1462d

AUTHORS.txt

@@ -0,0 +1,68 @@
+Principal Authors (major contributors, alphabetically)
+
+Ævar Arnfjörð Bjarmason
+Andrew Garrett
+Brion Vibber
+Marius Hoch
+Steve Sanbeg
+Yair rand
+
+Patch Contributors (minor contributors, alphabetically)
+
+Aaron Schulz
+Alex Monk
+Alex Z.
+Alexandre Emsenhuber
+Antoine Musso
+Aryeh Gregor
+Brad Jorsch
+Chad Horohoe
+Daniel Cannon
+Danny B.
+Derk-Jan Hartman
+Ed Sanders
+Fomafix
+Gabriel Wicke
+Happy-melon
+Alexander Emsenhuber
+Ivan Lanin
+Jackmcbarn
+James D. Forrester
+Jan Paul Posma
+Jens Frank
+Kevin Brown
+Kevin Israel
+Kunal Mehta
+Mark A. Hershberger
+Bartosz Dziewoński
+Max Semenik
+Meno25
+Moriel Schottlender
+Nemo bis
+Nick Jenkins
+Nik Everett
+Niklas Laxström
+Ori.livneh
+OverlordQ
+Peter Gehres
+Philip Tzou
+Platonides
+Purodha B Blissenbach
+Raimond Spekking
+Remember the dot
+Roan Kattouw
+Rob Church
+Robert Rohde
+Robin Pepermans
+Ryan Kaldari
+Sam Reed
+Shinjiman
+Siebrand Mazeland
+Thomas Dalton
+ThomasV
+Tim Starling
+Tim Weyer
+Tobias
+eranroz
+kghbln
+mrbluesky

Cite.php

@@ -22,9 +22,16 @@ $wgHooks['ParserFirstCallInit'][] = 'wfCite';
 $wgExtensionCredits['parserhook'][] = array(
 	'path' => __FILE__,
 	'name' => 'Cite',
-	'author' => array( 'Ævar Arnfjörð Bjarmason', 'Marius Hoch' ),
+	'author' => array(
+		'Ævar Arnfjörð Bjarmason',
+		'Andrew Garrett',
+		'Brion Vibber',
+		'Marius Hoch',
+		'Steve Sanbeg'
+	),
 	'descriptionmsg' => 'cite-desc',
-	'url' => 'https://www.mediawiki.org/wiki/Extension:Cite/Cite.php'
+	'url' => 'https://www.mediawiki.org/wiki/Extension:Cite/Cite.php',
+	'license-name' => 'GPLv2',
 );
 
 $wgParserTestFiles[] = __DIR__ . "/citeParserTests.txt";