Add configuration templates and getting started guide

Co-authored-by: kelinfoxy <67766943+kelinfoxy@users.noreply.github.com>

config-templates/promtail/promtail-config.yml

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+# Promtail Configuration Template
+# Copy this file to ./config/promtail/promtail-config.yml
+
+server:
+  http_listen_port: 9080
+  grpc_listen_port: 0
+
+positions:
+  filename: /tmp/positions.yaml
+
+clients:
+  - url: http://loki:3100/loki/api/v1/push
+
+scrape_configs:
+  # Docker container logs
+  - job_name: docker
+    static_configs:
+      - targets:
+          - localhost
+        labels:
+          job: docker
+          __path__: /var/lib/docker/containers/*/*-json.log
+
+    pipeline_stages:
+      # Parse Docker JSON logs
+      - json:
+          expressions:
+            output: log
+            stream: stream
+            attrs: attrs
+      
+      # Extract container name from path
+      - regex:
+          expression: '/var/lib/docker/containers/(?P<container_id>[^/]+)/.*'
+          source: filename
+      
+      # Add labels
+      - labels:
+          stream:
+          container_id:
+      
+      # Output the log line
+      - output:
+          source: output
+
+  # System logs (optional)
+  # - job_name: system
+  #   static_configs:
+  #     - targets:
+  #         - localhost
+  #       labels:
+  #         job: varlogs
+  #         __path__: /var/log/*.log