Add weblate to README.md

Signed-off-by: Paul Spooren <mail@aparcar.org>

README.md

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 # OpenWrt luci feed
 
+[![Translation status](https://hosted.weblate.org/widgets/openwrt/-/luci/svg-badge.svg)](https://hosted.weblate.org/engage/openwrt/?utm_source=widget)
+
 ## Description
 
 This is the OpenWrt "luci"-feed containing LuCI - OpenWrt Configuration Interface.