split kernel module api docs to README

rootfs_overlay/params.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+set -e
+d=/sys/module/params/parameters
+i="${d}/i"
+j="${d}/j"
+f=/sys/kernel/debug/lkmc_params
+
+insmod /params.ko
+[ "$(cat "$i")" = 0 ]
+[ "$(cat "$j")" = 0 ]
+[ "$(cat "$f")" = '0 0' ]
+printf 1 > "$i"
+[ "$(cat "$f")" = '1 0' ]
+printf 2 > "$j"
+[ "$(cat "$f")" = '1 2' ]
+rmmod params
+
+insmod /params.ko i=3 j=4
+[ "$(cat "$f")" = '3 4' ]
+rmmod params