doc: add docker-compose and default user to the installation document.

INSTALL.md

@@ -10,6 +10,17 @@ You can then install Answer in several ways:
  - binary installation
  - Source installation
 
+## Docker-compose for Answer
+```bash
+$ mkdir answer && cd answer
+$ wget https://raw.githubusercontent.com/answerdev/answer/main/docker-compose.yaml
+$ docker-compose up
+```
+
+browser open URL [http://127.0.0.1:9080/](http://127.0.0.1:9080/).
+
+You can log in with the default administrator username( **`admin@admin.com`** ) and password( **`admin`** ).
+
 ## Docker for Answer
 Visit Docker Hub or GitHub Container registry to see all available images and tags.
 

INSTALL_CN.md

@@ -10,6 +10,17 @@
  - 二进制安装
  - 源码安装
 
+## 使用 Docker-compose 安装 Answer
+```bash
+$ mkdir answer && cd answer
+$ wget https://raw.githubusercontent.com/answerdev/answer/main/docker-compose.yaml
+$ docker-compose up
+```
+
+启动完成后使用浏览器访问 [http://127.0.0.1:9080/](http://127.0.0.1:9080/).
+
+你可以使用默认的用户名：( **`admin@admin.com`** ) 和密码：( **`admin`** ) 进行登录.
+
 ## 使用Docker 安装 Answer
 可以从 Docker Hub 或者 GitHub Container registry 下载最新的tags 镜像