1、git submodule add jerryscript v2.4.0

2、support JerryScript on XiZi for stm32f407-st-discovery board and cortex-m4-emulator

APP_Framework/lib/JerryScript/README.md

@@ -0,0 +1,58 @@
+# jerryscript编译步骤，依赖 Ubuntu 20.04 操作系统.
+## 1、jerryscript源码下载
+
+JerryScript 源码以子模块的形式保存在xiuos/APP_Framework/lib/JerryScript/jerryscript下，进行编译前需要下载，在xiuos根目录下执行:
+
+```bash
+git submodule
+git submodule init
+git submodule update APP_Framework/lib/JerryScript/jerryscript
+```
+
+## 2、jerryscript编译依赖安装
+
+第一次编译需要安装依赖，在APP_Framework/lib/JerryScript路径下，依次执行:
+
+```
+jerryscript/tools/apt-get-install-deps.sh
+sudo apt install gcc-arm-none-eabi binutils-arm-none-eabi
+sudo apt install \
+    bison flex gettext texinfo libncurses5-dev libncursesw5-dev \
+    gperf automake libtool pkg-config build-essential gperf genromfs \
+    libgmp-dev libmpc-dev libmpfr-dev libisl-dev binutils-dev libelf-dev \
+    libexpat-dev gcc-multilib g++-multilib picocom u-boot-tools util-linux
+```
+
+## 3、jerryscript源码编译
+
+在APP_Framework/lib/JerryScript路径下，以stm32f4discovery开发板为例，执行:
+
+```bash
+jerryscript/tools/build.py \
+    --clean \
+    --lto=OFF \
+    --jerry-cmdline=OFF \
+    --jerry-math=ON \
+    --amalgam=ON \
+    --mem-heap=70 \
+    --profile=es.next \
+    --toolchain=${PWD}/jerryscript/cmake/toolchain_mcu_stm32f4.cmake
+```
+
+## 4、stm32f4discovery开发板bin包构建
+
+在xiuos/Ubiquitous/XiZi_IIoT目录下，执行
+
+```makefile
+make BOARD=stm32f407-st-discovery menuconfig
+```
+
+然后在menuconfig界面进入APP_Framework → app lib → lib using JerryScript ，完成勾选，保存退出。
+
+执行
+
+```makefile
+make BOARD=stm32f407-st-discovery
+```
+
+完成编译。