Update README.md

README.md

-#Packet Exchange repository
+# tsn-rt-measures repository
+
+clockres, latency-measure and packet-exchange are C programs wrote using
+the same structure as cyclictest, and borrows large portions of the cyclictest
+code:   
+
+They have a real-time thread doing measurements or time sensitive operations 
+at regular intervals, and a non real-time thread doing the I/O operations to
+report the results shared by the real-time thread
+The real-time thread can be assigned to CPU1 (which I chose to isolate on the Olimex boards) and
+can have it's priority set as an option, default is to 99. It writes results in a static structure.
+
+* clockres is used to determine the resolution of the clock (CLOCK_MONOTONIC), by doing successive
+calls to clock_gettime
+* latency-measure is used to determine the maximum wakeup latency of a real-time thread. It is
+a simplified version of cyclictest I wrote to have a better understanding and more control.
+* packet-exchange has a client and a server, which exchange UDP ethernet packets using real-time threads,
+and can send them on a ETF qdisc by setting a txtime timestamp.
+* scripts contain useful bash scripts to be used on the boards