Add information about funded development sponsors.

SPONSORS.md

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+List of companies (in alphabetical order) that helped to improve the Bareos project by funded development.
+
+Cardtech
+--------
+http://www.cardtech.de
+
+  * bareos-15.2.2
+    * Secure Erase feature
+      * Allow to define an external program (like wipe or shred.exe) for deleting data in a secure manner. This can be necessary to comply to strict industry standards and government regulations that force organizations to mitigate the risk of unauthorized exposure of confidential corporate and government data.
+
+Globalways
+----------
+http://www.globalways.net
+
+  * bareos-16.2.2
+    * Client Initiated Connection
+      * Allow File Daemons to connect to the Director, instead that he Director connects to the clients.
+
+Odiso
+-----
+http://www.odiso.com/
+
+  * bareos-14.2.2
+    * MS SQL Plugin
+      * Supports restore to file and restore to different database server.
+
+Thomas Magnete GmbH
+-------------------
+http://www.thomas-magnete.com/
+
+  * bareos-15.2.3
+    * Allow multiple simultaneous Windows VSS backups.
+