Feature/sdc integration romfs investigations (apache#20)

* Test implement of integration a ROM FS structure to code base

* Add command to execute before build

* Cleaning commit for submit

tools/esp32/genromfsheader.sh

@@ -0,0 +1,18 @@
+#! /bin/sh
+
+BASE=`dirname $0`
+WORKDIR=$BASE/romfs
+DESTDIR=boards/xtensa/esp32/esp32-core/include/
+echo "Generate the ROMFS header file based the template at $WORKDIR"
+
+SAVEDDIR=$PWD
+cd $WORKDIR
+./mkromfsimg.sh -nofat $SAVEDDIR
+cd $SAVEDDIR
+
+if [ -e $WORKDIR/nsh_romfsimg.h ]
+then
+    echo "$WORKDIR/nsh_romfsimg.h generated. It will be moved to $DESTDIR"
+    mv $WORKDIR/nsh_romfsimg.h $DESTDIR
+    echo "You can start build with make"
+fi

tools/esp32/romfs/img.template/data/sample.json

@@ -0,0 +1,222 @@
+[
+ {
+   "Items": "item1",
+   "Value": "value1",
+   "Comments": "comments1",
+   "Detail": "detail1",
+   "Rating": "rating1"
+ },
+ {
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+   "Value": "value2",
+   "Comments": "comments2",
+   "Detail": "detail2",
+   "Rating": "rating2"
+ },
+ {
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+   "Value": "value3",
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