feat(docs) add first iteration of compile script

scripts/find_version.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+# Credit: https://stackoverflow.com/a/4774063
+SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
+TMPENVFILE=$(mktemp /tmp/lvgl.script.XXXXXX)
+cat $SCRIPTPATH/../lvgl.h | grep "#define LVGL_VERSION_" | sed 's/#define //g' | sed -r 's/\s+/=/' > $TMPENVFILE
+. $TMPENVFILE
+rm $TMPENVFILE
+echo $LVGL_VERSION_MAJOR.$LVGL_VERSION_MINOR