新增部署Prometheus监控工具脚本；更新README.md文件

prometheus/roles/prometheus_webhook_dingtalk/templates/conf/config.yml.j2

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+## Request timeout
+# timeout: 5s
+
+## Uncomment following line in order to write template from scratch (be careful!)
+#no_builtin_template: true
+
+## Customizable templates path
+#templates:
+#  - contrib/templates/legacy/template.tmpl
+templates:
+  - /etc/prometheus-webhook-dingtalk/templates/legacy/template.tmpl
+
+## Targets, previously was known as "profiles"
+targets:
+  webhook1:
+    url: https://oapi.dingtalk.com/robot/send?access_token=xxxxxxxxxxxx
+    # secret for signature
+    secret: SEC000000000000000000000
+  webhook2:
+    url: https://oapi.dingtalk.com/robot/send?access_token={{ alert.dingtalk.access_token }}
+  webhook_legacy:
+    url: https://oapi.dingtalk.com/robot/send?access_token={{ alert.dingtalk.access_token }}
+    # Customize template content
+    message:
+      # Use legacy template
+       title: '{{ alert.message.title }}'
+       text: '{{ alert.message.text }}'
+  webhook_mention_all:
+    url: https://oapi.dingtalk.com/robot/send?access_token=xxxxxxxxxxxx
+    mention:
+      all: true
+  webhook_mention_users:
+    url: https://oapi.dingtalk.com/robot/send?access_token=xxxxxxxxxxxx
+    mention:
+      mobiles: ['156xxxx8827', '189xxxx8325']