Add the audio handling changes to build system and documentation

src/libs/decoders/Makefile.am

@@ -0,0 +1,33 @@
+noinst_LIBRARIES = libdecoders.a
+
+libdecoders_a_SOURCES = \
+	SDL_sound.c          \
+	SDL_sound.h          \
+	SDL_sound_internal.h \
+	audio_convert.c      \
+	wav.c                \
+	dr_wav.h             \
+	flac.c               \
+	dr_flac.h            \
+	opus.c               \
+	vorbis.c             \
+	stb_vorbis.h         \
+	mp3.cpp              \
+	mp3_seek_table.cpp   \
+	mp3_seek_table.h     \
+	dr_mp3.h             \
+	archive.h            \
+	xxhash.c             \
+	xxhash.h
+
+libdecoders_a_CXXFLAGS = \
+	$(AM_CXXFLAGS) \
+	$(CXXFLAGS) \
+	-Wpedantic \
+	-Wall
+
+libdecoders_a_CFLAGS = \
+	$(AM_CFLAGS) \
+	$(CFLAGS) \
+	-Wpedantic \
+	-Wall