Add configuration template file for PyCharm project setup

This template file provides a reference for developers to create their own configuration file without exposing sensitive information. It should be included in the PyCharm project structure, while the actual configuration file (network_configuration.json) should also be included in the project but excluded from version control.

network_configuration.example.json

@@ -0,0 +1,31 @@
+{
+    "unifi": {
+        "host": "https://unifi.example.com",
+        "username": "your_username",
+        "password": "your_password",
+        "site": "default",
+        "network_filter": {
+            "network_name": {
+                "name": "Human-readable name",
+                "subnet": "192.168.1",
+                "exclude_patterns": [
+                    "device-to-exclude*",
+                    "*another-pattern*"
+                ],
+                "unknown_device_patterns": [
+                    "tasmota*",
+                    "ESP-*"
+                ]
+            }
+        }
+    },
+    "mqtt": {
+        "Host": "mqtt.example.com",
+        "Port": 1883,
+        "User": "mqtt_username",
+        "Password": "mqtt_password",
+        "Topic": "%hostname_base%",
+        "FullTopic": "%prefix%/%topic%/",
+        "NoRetain": false
+    }
+}