新增部署Prometheus监控工具脚本；更新README.md文件

prometheus/roles/loki/templates/conf/loki-config.yaml.j2

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+auth_enabled: false
+
+server:
+  http_listen_port: 3100
+  grpc_listen_port: 9096
+
+common:
+  path_prefix: /tmp/loki
+  storage:
+    filesystem:
+      chunks_directory: /tmp/loki/chunks
+      rules_directory: /tmp/loki/rules
+  replication_factor: 1
+  ring:
+    instance_addr: 127.0.0.1
+    kvstore:
+      store: inmemory
+
+schema_config:
+  configs:
+    - from: 2020-10-24
+      store: boltdb-shipper
+      object_store: filesystem
+      schema: v11
+      index:
+        prefix: index_
+        period: 24h
+
+ruler:
+  alertmanager_url: http://{{ groups.server.0 }}:{{ alertmanager.port }}

prometheus/roles/loki/templates/docker-compose.yml.j2

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+version: "3.9"
+
+services:
+  loki:
+    image: {{ loki.image }}
+    container_name: {{ docker.network.name }}-loki
+    hostname: loki
+    restart: always
+    volumes:
+      - /etc/localtime:/etc/localtime:ro
+      - {{ loki.dir.conf }}/loki-config.yaml:/etc/loki/loki-config.yaml
+    networks:
+      - {{ docker.network.name }} 
+    ports:
+      - {{ loki.port }}:3100
+    command: "-config.file=/etc/loki/loki-config.yaml"
+
+networks:
+  {{ docker.network.name }}:
+    external: true
+    name: {{ docker.network.name }}