Add configuration templates and getting started guide

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

config-templates/prometheus/prometheus.yml

@@ -0,0 +1,49 @@
+# Prometheus Configuration Template
+# Copy this file to ./config/prometheus/prometheus.yml
+
+global:
+  scrape_interval: 15s
+  evaluation_interval: 15s
+  external_labels:
+    monitor: 'homelab'
+
+# Alertmanager configuration (optional)
+# alerting:
+#   alertmanagers:
+#     - static_configs:
+#         - targets:
+#           - alertmanager:9093
+
+# Load rules once and periodically evaluate them
+# rule_files:
+#   - "alerts/*.yml"
+
+# Scrape configurations
+scrape_configs:
+  # Prometheus itself
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:9090']
+
+  # Node Exporter - System metrics
+  - job_name: 'node-exporter'
+    static_configs:
+      - targets: ['node-exporter:9100']
+        labels:
+          instance: 'homelab-server'
+
+  # cAdvisor - Container metrics
+  - job_name: 'cadvisor'
+    static_configs:
+      - targets: ['cadvisor:8080']
+        labels:
+          instance: 'homelab-server'
+
+  # Add your own services here
+  # Example: Monitor a service with /metrics endpoint
+  # - job_name: 'my-service'
+  #   static_configs:
+  #     - targets: ['my-service:8080']
+  #       labels:
+  #         instance: 'homelab-server'
+  #         service: 'my-service'