picard: add page (#2201)

pages/common/picard.md

@@ -0,0 +1,15 @@
+# picard
+
+> Next generation MusicBrainz tagging application.
+
+- Start Picard:
+
+`picard`
+
+- Open a set of files:
+
+`picard {{path/to/file1.mp3}} {{path/to/file2.mp3}}`
+
+- Display the version of Picard installed:
+
+`picard --long-version`