Created mpd (markdown)

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+Shows mpd status in a textbox.
+
+       mympd = lain.widgets.mpd()
+
+Now playing songs are notified like this:
+
+       +--------------------------------------------------------+
+       | +-------+                                              |
+       | |/^\_/^\| Now playing                                  |
+    | |\ O O /| Cannibal Corpse (Hammer Smashed Face) - 1993 |
+    | | '.o.' | Hammer Smashed Face (Radio Disney Version)   |
+       | +-------+                                              |
+       +--------------------------------------------------------+
+
+Dependencies
+
+- imagemagick
+
+The function takes a table as optional argument, which can contain:
+
+Variable | Meaning | Type | Default
+--- | --- | --- | ---
+`password` | Mpd password | string | ""
+`host` | Mpd server | string | "127.0.0.1"
+`port` | Mpd port | string | "6600"
+`music_dir` | Music directory | string | "~/Music"
+`refresh_timeout` | Refresh timeout seconds | int | 1
+`color_artist` | Artist value color | string | `beautiful.fg_normal` or "#FFFFFF"
+`color_song` | Song value color | string | `beautiful.fg_focus` or "#FFFFFF"
+`spr` | Separator text between artist and song values | string | " "
+`app` | Music program to spawn on click | string | "ncmpcpp"
+`shadow` | Hide widget when there are no songs playing | boolean | false 
+
+**Note**: `spr` can be a markup text.
+
+`lain.widgets.mpd` outputs the following table:
+
+Variable | Meaning | Type
+--- | --- | ---
+`widget` | The textbox | `wibox.widget.textbox`
+`notify` | The notification | function
+
+Finally, you can control the widget with key bindings like these:
+
+    -- MPD control
+    awful.key({ altkey, "Control" }, "Up",
+    function ()
+        awful.util.spawn_with_shell( "mpc toggle || ncmpcpp toggle || ncmpc toggle || pms toggle", false )
+        mympd.notify()
+     end),
+    awful.key({ altkey, "Control" }, "Down",
+    function ()
+        awful.util.spawn_with_shell( "mpc stop || ncmpcpp stop || ncmpc stop || pms stop", false )
+        mympd.notify()
+    end),
+    awful.key({ altkey, "Control" }, "Left",
+    function ()
+        awful.util.spawn_with_shell( "mpc prev || ncmpcpp prev || ncmpc prev || pms prev", false )
+        mympd.notify()
+    end),
+    awful.key({ altkey, "Control" }, "Right",
+    function ()
+        awful.util.spawn_with_shell( "mpc next || ncmpcpp next || ncmpc next || pms next", false )
+        mympd.notify()
+    end),
+
+where `altkey = "Mod1"`.
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