added change log file

diff --git a/ChangeLog.while-until-loops b/ChangeLog.while-until-loops
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+2010-01-26  BVK Chaitanya  <bvk.groups@gmail.com>
+
+       While and until loops support to GRUB script.
+
+       * include/grub/script_sh.h (grub_script_cmdwhile): New struct.
+       (grub_script_create_cmdwhile): New function prototype.
+       (grub_script_execute_cmdwhile): New function prototype.
+       * script/execute.c (grub_script_execute_cmdwhile): New function.
+       * script/parser.y (command): New commands.
+       (whilecmd): New grammar rule.
+       (untilcmd): New grammar rule.
+       * script/script.c (grub_script_create_cmdwhile): New function.
+       * util/grub-script-check.c (grub_script_execute_cmdwhile): New
+       function.
+