[licenses] Add path to LICENSE file in README.fuchsia.

This makes it easier for license checking tools to find
the correct license file.

More info: http://shortn/_S8Rzw4fSCw

Change-Id: I9d9c8319ed5ddecfc73df39c043757342b7e7468
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/iperf/+/767582
Reviewed-by: Yuxiao Sun <yuxiaosun@google.com>

README.fuchsia

diff --git a/README.fuchsia b/README.fuchsia
index 7d5dab2..8bb2276 100644
--- a/README.fuchsia
+++ b/README.fuchsia
@@ -1,3 +1,7 @@
+Name: iperf
+License File: LICENSE
+Description:
+
 Modifications from upstream for Fuchsia compatibility
 -------
 * Use Fuchsia specific random in iperf_util.c