edited readme

README

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+--------------
+AVTP Experimental Backend version
+--------------
+
+The IEEE 1722 AVTP media clock backend is located in linux/avb.
+It needs to update the OpenAvnu submodule. 
+PTP and MRP daemons have to be running for the backend to work.
+
+Start jackd2 with the following arguments:
+
+tbd...
+
+
+
+
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 jackdmp (aka JACK2) for Linux, MacOSX, Windows and Solaris
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linux/avb/OpenAvnu

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-Subproject commit df587b7509a4dee7fa79a40eec5d6327310c472b
+Subproject commit 985f3e382e0eecd74b269a7f1d52ce0719914489