Add README

README.md

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+# improv-setup
+
+Configure Wifi credentials on IOT devices using [Improv](https://www.improv-wifi.com/) serial protocol.
+
+```
+Usage: improv-setup device [OPTIONS] <PATH> [COMMAND]
+
+Commands:
+  state     Request current state
+  set-wifi  Set wifi credentials
+  info      Request device info
+  help      Print this message or the help of the given subcommand(s)
+
+Arguments:
+  <PATH>  Path to the serial device
+
+Options:
+      --baud-rate <BAUD_RATE>  Baud rate used for connecting to the serial device [default: 115200]
+  -h, --help                   Print help
+```