Add project page for picard plugins.

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+---
+title: Picard Plugins
+copyright: 2020 Nick Bowler
+license: gpl-3 or (at your option) any later version
+---
+
+I maintain a variety of extensions which make the [MusicBrainz
+Picard][picard-homepage] tagger even better than it already is.
+
+[picard-homepage]: https://picard.musicbrainz.org/
+
+# Obtaining the plugins
+
+[picard-plugins-gitweb]: //git.draconx.ca/gitweb/picard-plugins.git
+
+As a collection of extension programs, there are no release packages per se.
+The collection [may be browsed online][picard-plugins-gitweb] or cloned
+directly using git, e.g.,
+
+<kbd>git clone https://git.draconx.ca/picard-plugins.git</kbd>
+
+Alternately, direct links to the latest revision of individual plugins are
+provided below.
+
+# Installation
+
+Individual plugins may be installed by simply placing them in the Picard user
+directory, typically `~/.config/MusicBrainz/Picard/plugins/`.  A newly
+installed plugin will be disabled by default and must be enabled in Picard's
+plugin dialog.
+
+Note that Picard must be restarted after any plugin changes in order for them
+to take effect.
+
+# List of Plugins
+
+[karaoke-flagger-plugin]: //git.draconx.ca/gitweb/picard-plugins.git/blob_plain/HEAD:/karaoke-flagger.py
+[external-script-plugin]: //git.draconx.ca/gitweb/picard-plugins.git/blob_plain/HEAD:/external-script-manager.py
+[tweak-filename-plugin]: //git.draconx.ca/gitweb/picard-plugins.git/blob_plain/HEAD:/tweak-filename-filter.py
+[no-remote-plugin]: //git.draconx.ca/gitweb/picard-plugins.git/blob_plain/HEAD:/no-remote-plugins.py
+
+Where relevant, detailed usage information for these plugins is displayed
+in Picard's plugin dialog after installation.
+
+[Karaoke+ Flagger][karaoke-flagger-plugin]
+
+: Enabling this plugin adds new metadata variables so that Picard tagger
+  scripts can identify recordings which have the "karaoke version of..."
+  relationship.  This is useful as part of a system to generate playlists
+  for your karaoke dance parties (or to just exclude karaoke tracks from
+  your normal playlists).
+
+  Recordings of audio dramas are flagged similarly.
+
+[vim-homepage]: https://www.vim.org/
+
+[External Script Manager][external-script-plugin]
+
+: Enabling this plugin will allow tagger scripts to be almost entirely managed
+  outside of Picard and edited using [your favourite editor][vim-homepage].
+  Aside from the obvious benefit of using a real editor, this is useful for
+  tracking script changes in Git or synchronizing scripts between different
+  Picard installations.
+
+[Tweak Filename Filter][tweak-filename-plugin]
+
+: Prior to generating filenames, Picard will substitute directory separators
+  in metadata with underscores.  This behaviour cannot be adjusted in a file
+  naming script as the script only gets the metadata after this substitution.
+  Enabling this plugin adds additional configuration options to adjust how
+  this substitution is performed.
+
+[No Remote Plugins][no-remote-plugin]
+
+: Picard's plugins dialog by default contains a list of online plugins that
+  Picard will automatically download and install at the push of a button.
+  Unfortunately many of these online plugins have missing or unclear license
+  information and as such are probably non-free.
+
+  Enabling this plugin will prevent Picard from downloading the online plugin
+  list at startup so that it cannot entice you to install proprietary plugins.
+  The only plugins displayed in the UI will be those you have manually placed
+  in the plugins directory.
+
+# License
+
+These plugins are free software: you can redistribute and/or modify them
+under the terms of the GNU General Public License as published by the Free
+Software Foundation, either version 3 of the License or (at your option)
+any later version.