readme: add initial README

README.md

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+# usteer
+
+usteer is a client steering daemon written for OpenWrt.
+
+Its goal is to optimize roaming behavior of wireless clients (STAs) in a ESS consisting of multiple BSS / APs.
+
+## Functions
+
+ - Synchronization of Neighbor Reports between multiple APs
+ - Policy-based decisions for probe- / association- / authentication requests received from STAs
+ - Requesting clients to roam to a different BSS based on SNR / signal-level
+ - Channel-load based client steering to different BSS
+
+## Installation
+
+usteer is available from the OpenWrt packages feed and can be installed on devices running OpenWrt 21.02+ using opkg:
+
+```
+opkg update; opkg install usteer
+```
+
+## Submitting patches
+
+usteer patches are welcome on the openwrt-devel mailing list.
+
+Before submitting patches, check out OpenWrts guide on submission policies.
+
+Make sure to add a `usteer` subject prefix using the `--subject-prefix` option when exporting the patch with `git format-patch`.