readme

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diff --git a/BatteryWidget/README.md b/BatteryWidget/README.md
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--- a/BatteryWidget/README.md
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@@ -1,6 +1,24 @@
-# Battery widget
-Simple and easy-to-install widget for Awesome Window Manager
+## Battery widget
+Simple and easy-to-install widget for Awesome Window Manager.
 
 Basically this widget consist of an icon which shows the battery status: ![Battery Widget](./batWid1.png)
 
 And a pop-up window, which shows when you hover over it: ![Battery Widget](./batWid2.png)
+
+## Installation
+
+This widget ueses the output of acpi tool.
+
+- install `acpi` tool:
+-
+{% highlight bash %}
+sudo apt-get install acpi
+{% endhighlight %}
+
+- clone/copy battery.lua file and battery-icons folder to your ~/home/username/.config/awesome/ folder;
+
+- add battery widget to your wibox in rc.lua:
+
+{% highlight lua%}
+right_layout:add(batteryIcon)
+{% endhighlight %}