Add installation info for go language to README in polygerrit-ui
Add installation info for go language to README in polygerrit-ui

It is required to execute run-server.sh

Change-Id: I13e20df40de7f2a845d0c1a18c1fa3287fd94987
Signed-off-by: Eryk Szymanski <13b9ab9e39588f6199249899667f35a7ff4d4fb0@gmail.com>

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