Add plugin.info to tw2parser

Every plugin must have a plugin.info file to be valid

plugins/tiddlywiki/tw2parser/plugin.info

@@ -0,0 +1,6 @@
+{
+	"title": "$:/plugins/tiddlywiki/tw2parser",
+	"description": "TiddlyWiki Classic-compatible wikitext parser",
+	"author": "JeremyRuston",
+	"core-version": ">=5.0.0"
+}