build openwrt souce code

jack_admin

step1:

git clone https://gitee.com/yanyitech/openwrt.git

cd openwrt

### Quickstart

1. Run `./scripts/feeds update -a` to obtain all the latest package definitions
   defined in feeds.conf / feeds.conf.default

2. Run `./scripts/feeds install -a` to install symlinks for all obtained
   packages into package/feeds/

3. Run `make menuconfig` to select your preferred configuration for the
   toolchain, target system & firmware packages.

4. Run `make` to build your firmware. This will download all sources, build the
   cross-compile toolchain and then cross-compile the GNU/Linux kernel & all chosen
   applications for your target system.