Merge branch '17-line-and-block-comments' into 'master'

add lexer rules for line and block comments

Closes #17

See merge request mkais001/klang!12

src/main/antlr4/de/hsrm/compiler/Klang/Klang.g4

@@ -171,6 +171,14 @@ IDENT
   : [a-zA-Z][a-zA-Z0-9]*
   ;
 
+BLOCK_COMMENT
+	: '/*' .*? '*/' -> skip
+	;
+
+LINE_COMMENT
+	: '//' ~[\r\n]* -> skip
+	;
+
 WS
  : [ \t\r\n] -> skip
  ;