audiobookshelf: Initial version of role

roles/audiobookshelf/files/audiobookshelf.default

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+METADATA_PATH=/srv/audiobookshelf/metadata
+CONFIG_PATH=/srv/audiobookshelf/config
+PORT=13378
+HOST=127.0.0.1

roles/audiobookshelf/files/meta.md

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+= Preparing files for upload =
+
+== Filenames ==
+
+Filenames should always contain track number (and optionally disc number) with leading zeros first and subtitle after that. Few exmaples:
+
+```
+01. Luku.mp3
+01. Osa.mp3
+CD 1 - 01.mp3
+```
+
+Directory should also contain `cover.jpg` with book cover picture and `desc.txt` containing book description.
+
+== Metadata (id3 tags) ==
+
+First clear old tags then set new ones:
+
+```
+id3v2 -D "01. Osa.mp3"
+id3v2 \
+    --TPE1 "Douglas Adams" \
+    --TALB "$(echo 'Linnunradan käsikirja liftareille' | iconv -f utf-8 -t iso-8859-1)" \
+    --TCOM "$(echo 'Heikki Kinnunen,Pekka Autiovuori,Yrjö Järvinen,Martti Järvinen,Esa Saario,Kauko Helavirta,Aila Svedberg' | iconv -f utf-8 -t iso-8859-1)" \
+    --TLAN "fi" \
+    --TPUB "Yleisradio" \
+    --TYER 1984 \
+    --genre "Science Fiction/Fiction/Humor" \
+    "01. Osa.mp3"
+```