Add doc/design/task_history.txt.

Pavel Kovalenko · Pavel Kovalenko · commit 093ccb432b7e · 2014-10-02T04:04:43.000+04:00
diff --git a/doc/design/task_history.txt b/doc/design/task_history.txt
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+TITLE: X-Ray Engine 1.6 task history
+
+--------------------------------
+

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+Diff line change
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 +TITLE: X-Ray Engine 1.6 task history
++
 +--------------------------------
++