Add support for working group in first page

AuthReportConfig.tex

@@ -15,6 +15,7 @@
 % \CoAuthorMail:    Co-author's mail [optional]
 % \DocTitle:        To print document title (also in fancyheader)
 % \CoAuthorAEM :    Co-author's AEM [optional]
+% \WorkGroup:       Working group of the assignment/project
 % \Department:      The School
 % \ClassName:       Class name to print (also in fancyheader)
 % \InstructorName:  To print instructor's mame
@@ -161,6 +162,7 @@
         \begin{minipage}{0.4\textwidth}
             \begin{flushleft}
                 \large
+                \ifdefined \WorkGroup \emph{\textsc{\WorkGroup}}\\[2ex]\fi
                 \ifdefined \CoAuthorName \emph{Συντάκτες:} \else \emph{Συντάκτης:}\fi  \\
                 \textsc{\AuthorName}     \\
                 \textsc{AEM:\AuthorAEM}  \\[1ex]