Update README.md

(cherry picked from commit c04796fd)

README.md

-# Test repo for TS 33.128
+# 3GPP SA3-LI - Trial repository
 
-Test area for experimenting with what to put on the Trial area...
+Trial repository for the 3GPP SA3-LI working group.
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+
+(c) 2019, 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC).
+All rights reserved.
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