audio_player: add pkg recipe

Fixes #125.

recipes/pkg/audio_player/README

@@ -0,0 +1,28 @@
+Minimal audio player based on libav
+
+To deploy it in sculpt add the following snippet to the deploy config
+(or better yet, put it into a launcher file) and adapt it to your
+system:
+
+  <start name="audio_player" pkg="xxxx/pkg/audio_player/yyyy-yy-yy">
+    <config state="playing">
+      <report progress="yes" interval="1" playlist="1"/>
+      <vfs> <fs label="media"/> </vfs>
+      <libc/>
+    </config>
+    <route>
+      <service name="Audio_out"> <child name="audio_mixer"/> </service>
+      <service name="File_system" label="media"> <child name="media_fs"/> </service>
+      <service name="Report"> <parent/> </service>
+      <service name="ROM" label="playlist"> <child name="media_rom"/> </service>
+    </route>
+  </start>
+
+
+The playlist ROM contains a list of audio files that should be played. Its
+format is as follows:
+
+  <playlist mode="repeat">
+    <track path="foo.ogg"/>
+    <track path="foo.flac"/>
+  </playlist>

recipes/pkg/audio_player/archives

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+_/src/audio_player
+_/src/libav
+_/src/libc
+_/src/vfs
+_/src/zlib

recipes/pkg/audio_player/hash

@@ -0,0 +1 @@
+2018-06-01-a 6d9946d4e01732b84d9496968818123f36ce4745

recipes/pkg/audio_player/runtime

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+<runtime ram="32M" caps="200" binary="audio_player">
+
+	<requires> <audio_out/> <timer/> <file_system/> </requires>
+
+	<config/>
+
+	<content>
+		<rom label="ld.lib.so"/>
+		<rom label="audio_player"/>
+		<rom label="libc.lib.so"/>
+		<rom label="libm.lib.so"/>
+		<rom label="zlib.lib.so"/>
+		<rom label="vfs.lib.so"/>
+		<rom label="avcodec.lib.so"/>
+		<rom label="avfilter.lib.so"/>
+		<rom label="avformat.lib.so"/>
+		<rom label="avresample.lib.so"/>
+		<rom label="avutil.lib.so"/>
+	</content>
+
+</runtime>