Add a README for dependencies

Signed-off-by: Julien Desfossez <julien.desfossez@polymtl.ca>

diff --git a/ust-systemtap-tracepoints/README.txt b/ust-systemtap-tracepoints/README.txt
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+The purpose of this benchmark is to compare the performance for
+userspace tracing of SystemTap and LTTng-UST.
+10 million events generated per thread, number of threads vary.  Each
+event generates a time-stamp and contains a 4-byte integer value.
+
+These four tests can be performed :
+- UST in flight recorder mode
+- UST writing the trace to disk
+- SystemTap in flight recorder mode
+- SystemTap writing the trace to disk
+
+Dependencies
+- LTTng-UST (tested on v0.11) : git://git.lttng.org/ust.git
+- SystemTap (tested on v1.2-5 from debian packages)
+- systemtap-sdt-dev for dtrace
+