clear empty files and add readme

-J

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-[-rw-r--r-- Rosa     staff    314K Oct 30 15:04]  tree.json  [error opening dir]
-
-0 directories, 1 file

README.md

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+# Granularchive
+
+For more info, see the [wiki entry](https://pzwiki.wdka.nl/mediadesign/Granularchive)
+

data/super audio file online.webloc

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-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>URL</key>
-	<string>https://file-examples.com/wp-content/storage/2017/11/file_example_MP3_700KB.mp3</string>
-</dict>
-</plist>