Created calendar (markdown)

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+Attaches a calendar to a ``widget``. Example:
+
+    lain.widgets.calendar:attach(mytextclock)
+
+- Left click: switch to previous month.
+- Right click: switch to next month.
+
+Optionally you can call the function with background and foreground colors arguments, both or just one:
+
+    lain.widgets.calendar:attach(mytextclock, "#FFFFFF", "#000000")
+    -- or
+    lain.widgets.calendar:attach(mytextclock, "#FFFFFF")
+    -- or
+    lain.widgets.calendar:attach(mytextclock, nil, "#000000")
+
+Notification will show an icon displaying current day, and formatted output
+from ``cal`` with current day highlighted.
+
+Calendar icons are placed in [lain/icons/cal](https://github.com/copycat-killer/lain/tree/master/icons/cal), default set being ``white``.
+
+You can add your own set, and tell lain to use it like this:
+
+    lain.widgets.calendar.icons_dir = lain.widgets.icons_dir .. "cal/myicons"
+
+also, you can set notification font size:
+
+    lain.widgets.calendar.font_size = 14
+
+default is 12.
+
+Finally, you can call the notification with a key binding like this:
+
+    awful.key({ altkey }, "c", function () lain.widgets.calendar:show(7) end),
+
+where ``altkey = "Mod1"`` and ``show`` argument is an optional integer, meaning timeout seconds.
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