add libsonic as a submodule

cloned from
https://github.com/lrusak/plugin.audio.subsonic/commit/ad830b67ddf88926e
12f75952e341d8d842cdb27

lib/py-sonic/CHANGELOG.md

@@ -0,0 +1,57 @@
+## 0.6.2
+
+* Added an option to use GET requests, instead of the default POST requests
+
+## 0.6.1
+
+* Added `legacyAuth` option for pre-1.13.0 support
+
+## 0.6.0
+
+* Added API 1.14.0 support
+
+## 0.5.1
+
+* Added the ability to use a netrc file for credentials
+
+## 0.5.0
+
+* Added support for using credentials via a netrc file
+
+## 0.4.1
+
+* Fixed SSL handling issues
+
+## 0.4.0
+
+* Added missing 1.12.0 API items
+* Added 1.13.0 API items
+* All timestamps both passed in, and returned, should now be in **proper** unix time, which is seconds since the epoch, **not** milliseconds since the epoch
+
+## 0.3.5
+
+* allow for self-signed certs
+
+## 0.3.4
+
+* Add missing parameters to getAlbumList2 (thanks to basilfx)
+* Remove trailing whitespace (thanks to basilfx)
+
+## 0.3.3
+
+* Added support for API version 1.11.0
+* Added a couple of additions from API version 1.10.x that were previously 
+  missed
+
+## 0.3.1
+
+*  Incorporated unofficial API calls (beallio)
+
+## 0.2.1
+
+*  Added a patch to force SSLv3 as some users were apparently having issues
+   with the 4.7 release of Subsonic and SSL.  (thanks to orangepeelbeef)
+
+## 0.2.0
+
+*  Added support for API version 1.8.0 (Subsonic verion 4.7)