add README-STA-steering.md

src/README-STA-steering.md

+
+## STA steer policy configuration parameters according to EasyMesh standard ##
+````
+config sta_steering
+	option enable_sta_steer '1'
+    option rcpi_threshold_2g '75'
+    option rcpi_threshold_5g '85'
+    option rcpi_threshold_6g '85'
+    option report_rcpi_threshold_2g '85'
+    option report_rcpi_threshold_5g '95'
+    option report_rcpi_threshold_6g '95'
+	:
+    .
+    option plugins_enabled '1'
+    option plugins_policy 'any'     # 'any' or 'all'. default = 'any'
+    list plugins 'rcpi'
+    list plugins 'rate'
+````
+
+## rcpi.so specific config section ##
+
+````
+config sta-steer 'rcpi'
+	option enabled '1'
+    option diffsnr '8'
+    option bandsteer '0'
+    option use_bcn_metrics '1'
+    option use_usta_metrics '1'
+	option steer_retry_int '30'
+    option steer_int '180'
+    option steer_disable_int '600'
+
+    :
+    .
+    option max_steer_attempt '-1'   # default = -1 (unlimited)
+````
+
+## rate.so specific config section ##
+
+````
+config sta-steer 'rate'
+	option enabled '1'
+	option threshold '40'
+    option margin '10'
+    option boost '20'
+    :
+    .
+    option max_steer_attempt '1'    # max 1 attempt in STA's connection session
+````