feat: add ansible cheatsheet. (#23)

docs/ansible.md

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+Ansible 备忘清单
+====
+
+此快速参考备忘单提供了使用 Ansible 的各种方法。
+
+入门
+---
+### 安装
+安装命令 | 环境
+:-|-
+`brew install ansible`   | macos
+`yum install -y ansible` | centos
+`pip install ansible`    | python
+
+### 配置位置
+文件路径 | 说明
+:-|-
+`/etc/ansible/ansible.cfg`  | 系统范围的配置
+`~/ansible.cfg`             | 用户特定的配置
+`$pwd/ansible.cfg`          | 当前目录下的配置
+
+### Inventory文件(hosts列表)
+#### 静态Inventory
+`/etc/ansible/hosts`
+```INI
+mail.example.com
+
+[webservers]
+foo.example.com
+bar.example.com
+```
+
+## 命令行(ad-hoc)
+### ansible
+检查Inventory是否生效
+```shell
+ansible all --list-hosts
+```
+ping所有目标
+```shell
+$ ansible all -m ping
+```
+ping本地(不使用SSH连接)
+```shell
+$ ansible all -i localhost, -e '{"ansible_connection": "local"}' -m ping
+```
+<!--rehype:className=wrap-text -->
+本地执行命令
+```shell
+$ ansible all -i localhost, -e '{"ansible_connection": "local"}' -a 'hostname'
+```
+<!--rehype:className=wrap-text -->
+获取本地主机的信息
+```shell
+$ ansible all -i localhost, -e '{"ansible_connection": "local"}' -m setup
+``` 
+<!--rehype:className=wrap-text -->
+获取远程到本地
+```shell
+$ ansible target -m fetch -a "src=/tmp/seq dest=/tmp/seq"
+``` 
+<!--rehype:className=wrap-text -->
+拷贝本地到远程
+```shell
+$ ansible target -m copy -a "src=/tmp/seq dest=/tmp/seq"
+``` 
+<!--rehype:className=wrap-text -->
+
+
+<!-- ### ansible-playbook -->
+<!-- todo -->
+
+
+
+另见
+---
+[Getting started with Ansible](https://docs.ansible.com/ansible/latest/getting_started/index.html)  
+[Introduction to ad hoc commands](https://docs.ansible.com/ansible/latest/user_guide/intro_adhoc.html)