docs: add project description and server setup instructions to README

server/config/devices.yaml

@@ -0,0 +1,39 @@
+# Demeter Device Registry
+# Maps ESP sensor nodes to their CoAP resources.
+# Edit this file to add/remove devices for your deployment.
+
+devices:
+  - id: "esp32-plant-01"
+    name: "Plant Monitor - Bedroom"
+    ip: "192.168.1.100"
+    port: 5683
+    enabled: true
+    resources:
+      - uri: "sensors/soil_moisture"
+        name: "Soil Moisture"
+        type: "periodic"
+      - uri: "sensors/temperature"
+        name: "Temperature"
+        type: "periodic"
+      - uri: "sensors/water_level"
+        name: "Water Level"
+        type: "periodic"
+      - uri: "events/trigger"
+        name: "Trigger Events"
+        type: "event"
+
+  - id: "esp32-aquarium-01"
+    name: "Aquarium Monitor"
+    ip: "192.168.1.101"
+    port: 5683
+    enabled: true
+    resources:
+      - uri: "sensors/temperature"
+        name: "Water Temperature"
+        type: "periodic"
+      - uri: "sensors/water_level"
+        name: "Tank Level"
+        type: "periodic"
+      - uri: "events/trigger"
+        name: "Float Switch"
+        type: "event"