Add readme

README.md

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+# OpenWrt builder
+
+For OpenWrt >= 21.02
+
+## Install dependencies
+
+```
+sudo apt-get install git git-core curl rsync
+sudo apt-get install build-essential subversion libncurses5-dev zlib1g-dev gawk gcc-multilib flex gettext libssl-dev unzip
+```
+
+## Build firmware
+
+```
+git clone https://github.com/openwrt-xiaomi/builder -b v21 openwrt-v21
+cd openwrt-v21
+./xcreate.sh -v xq-21.02.1
+cd xq-21.02.1
+./xupdate.sh -f
+./xmake.sh -f -t r3d
+```