Created net (markdown)

net.md

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+Monitors network interfaces and shows current traffic in a textbox. 
+
+    mynet = lain.widgets.net()
+
+The function takes a table as optional argument, which can contain:
+
+Variable | Meaning | Type | Default
+--- | --- | --- | ---
+`iface` | Network device | string | autodetected
+`refresh_timeout` | Refresh timeout seconds | int | 2
+`units` | Units | int | 1024 (kilobytes) 
+`spr` | Separator text between download and upload values | string | " "
+`header` | Text to show before value | string | `iface`
+`header_color` | Header color | string | `beautiful.fg_normal` or "#FFFFFF"
+`color_up` | Upload value color | string | `beautiful.fg_focus` or "#FFFFFF"
+`color_down` | Download value color | string | `beautiful.fg_focus` or "#FFFFFF"
+`app` | Net program to spawn on click | string | "sudo wifi-menu"
+
+**Note**: `spr` can be a markup text.
+
+Possible value for `units` are stored in table `lain.widgets.net.units`, which contains:
+
+   {
+       ["b"] = 1,
+       ["kb"] = 1024,
+       ["mb"] = 1024^2,
+       ["gb"] = 1024^3
+   }
+
+