增加 Dnsmasq DNS 和 DHCP 服务.

Signed-off-by: lion.chan <cy187lion@sina.com>

Software/Applications/Dnsmasq/Dnsmasq_DNS_和_DHCP_服务.md

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+# Dnsmasq DNS 和 DHCP 服务
+
+dnsmasq provides a DNS server, a DHCP server with support for DHCPv6 and PXE, and a TFTP server. It is designed to be lightweight and have a small footprint, suitable for resource constrained routers and firewalls. dnsmasq can also be configured to cache DNS queries for improved DNS lookup speeds to previously visited sites.
+
+## 1.安装
+
+```bash
+# Manjaro
+pacman -S dnsmasq
+```
+
+## 2.配置
+
+```bash
+# /etc/dnsmasq.conf
+interface=<network interface>
+expand-hosts
+domain=foo.bar
+
+dhcp-range=<start ip>,<end ip>,<mask>,<keep time>
+```
+
+## 3.启动和关闭
+
+```bash
+systemctl enable dnsmasq.service
+systemctl start dnsmasq.service
+systemctl stop dnsmasq.service
+```