xquic readme: add complie document

modules/ngx_http_xquic_module/README.md

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+# ngx_http_xquic_module
+
+Tengine ngx_http_xquic_module 主要用于在服务端启用 QUIC/HTTP3 监听服务。
+
+# 编译
+
+ngx_http_xquic_module 编译依赖
+
+依赖库：
+
+* Tongsuo: https://github.com/Tongsuo-Project/Tongsuo
+* xquic: https://github.com/alibaba/xquic
+
+```shell
+# 下载 Tongsuo，示例中下载 8.3.2 版本
+wget -c "https://github.com/Tongsuo-Project/Tongsuo/archive/refs/tags/8.3.2.tar.gz"
+tar -x 8.3.2.tar.gz
+
+# 下载 xquic，示例中下载 1.6.0 版本
+wget -c "https://github.com/alibaba/xquic/archive/refs/tags/v1.6.0.tar.gz"
+tar -xf v1.6.0.tar.gz
+
+# 下载 Tengine 3.0.0 以上版本，示例从 master 获取最新版本，也可下载指定版本
+git clone [email protected]:alibaba/tengine.git
+
+# 编译 Tongsuo
+cd Tongsuo-8.3.2
+./config --prefix=/usr/local/babassl
+make
+make install
+export SSL_TYPE_STR="babassl"
+export SSL_PATH_STR="${PWD}"
+export SSL_INC_PATH_STR="${PWD}/include"
+export SSL_LIB_PATH_STR="${PWD}/libssl.a;${PWD}/libcrypto.a"
+cd ../../
+
+# 编译 xquic 库
+cd xquic-1.6.0/
+mkdir -p build; cd build
+cmake -DXQC_SUPPORT_SENDMMSG_BUILD=1 -DXQC_ENABLE_BBR2=1 -DXQC_DISABLE_RENO=0 -DSSL_TYPE=${SSL_TYPE_STR} -DSSL_PATH=${SSL_PATH_STR} -DSSL_INC_PATH=${SSL_INC_PATH_STR} -DSSL_LIB_PATH=${SSL_LIB_PATH_STR} ..
+make
+cp "libxquic.so" /usr/local/lib/
+cd ..
+
+# 编译 Tengine
+cd tengine
+
+# 注：xquic 依赖 ngx_http_v2_module，需要参数 --with-http_v2_module
+./configure \
+  --prefix=/usr/local/tengine \
+  --sbin-path=sbin/tengine \
+  --with-xquic-inc="../xquic-1.6.0/include" \
+  --with-xquic-lib="../xquic-1.6.0/build" \
+  --with-http_v2_module \
+  --without-http_rewrite_module \
+  --add-module=modules/ngx_http_xquic_module \
+  --with-openssl="../Tongsuo-8.3.2"
+
+make
+make install
+```
+
+精简示例配置，其中 default-fake-certificate.pem 为可用证书。
+
+```nginx
+worker_processes  1;
+
+events {
+    worker_connections  1024;
+}
+
+xquic_log   "pipe:rollback /usr/local/tengine/logs/tengine-xquic.log baknum=10 maxsize=1G interval=1d adjust=600" info;
+
+http {
+    xquic_ssl_certificate        /usr/local/tengine/ssl/default-fake-certificate.pem;
+    xquic_ssl_certificate_key    /usr/local/tengine/ssl/default-fake-certificate.pem;
+
+    server {
+        listen 2443 xquic reuseport;
+
+        location / {
+        }
+    }
+}
+```
+
+启动 tengine
+
+```shell
+/usr/local/tengine/sbin/tengine -p /usr/local/tengine/ -c conf/nginx.conf
+```
+
+启动后 tengine 监听 2443 UDP 端口，此端口可以接收 HTTP3 请求，可以通过编译 xquic 自带的 `test_client` 测试（cmake 编译 xquic 时需要带 `-DXQC_ENABLE_TESTING=1` 参数）
+
+```shell
+./test_client -a 127.0.0.1 -p 2443 -u https://domain/
+```
+
+更为详细的指令可参考官网文档 [XQUIC模块](http://tengine.taobao.org/document_cn/xquic_cn.html)