新增说明文件；新增Docker、Redis、Tomcat示例

examples/tomcat.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=Apache Tomcat
+Documentation=https://tomcat.apache.org
+After=network-online.target firewalld.service
+Wants=network-online.target
+
+[Service]
+Type=forking
+ExecStart=/opt/tomcat/apache-tomcat-9.0.89/bin/startup.sh
+ExecReload=/opt/tomcat/apache-tomcat-9.0.89/bin/shutdown.sh & kill -9 $(ps aux | grep /opt/toomcat/apache-tomcat-9.0.89 | grep -v grep | awk '{print $2}' | tr -d ' ') & /opt/tomcat/apache-tomcat-9.0.89/bin/startup.sh
+ExecStop=/opt/tomcat/apache-tomcat-9.0.89/bin/shutdown.sh
+Restart=always
+
+[Install]
+WantedBy=multi-user.target