Add configuration file support

config.json

@@ -0,0 +1,17 @@
+{
+  "update_interval": 5,
+  "display": {
+    "show_cpu": true,
+    "show_memory": true,
+    "show_disk": true,
+    "show_network": true,
+    "show_processes": true,
+    "show_temperatures": true
+  },
+  "process_limit": 5,
+  "alert_thresholds": {
+    "cpu_percent": 80,
+    "memory_percent": 85,
+    "disk_percent": 90
+  }
+}

config_manager.py

@@ -0,0 +1,50 @@
+"""
+Configuration management for tracker
+"""
+
+import json
+import os
+
+
+class Config:
+    def __init__(self, config_file='config.json'):
+        self.config_file = config_file
+        self.config = self.load_config()
+
+    def load_config(self):
+        """Load configuration from JSON file"""
+        if os.path.exists(self.config_file):
+            with open(self.config_file, 'r') as f:
+                return json.load(f)
+        return self.get_default_config()
+
+    def get_default_config(self):
+        """Return default configuration"""
+        return {
+            'update_interval': 5,
+            'display': {
+                'show_cpu': True,
+                'show_memory': True,
+                'show_disk': True,
+                'show_network': True,
+                'show_processes': True,
+                'show_temperatures': True
+            },
+            'process_limit': 5,
+            'alert_thresholds': {
+                'cpu_percent': 80,
+                'memory_percent': 85,
+                'disk_percent': 90
+            }
+        }
+
+    def get(self, key, default=None):
+        """Get configuration value"""
+        keys = key.split('.')
+        value = self.config
+        for k in keys:
+            if isinstance(value, dict):
+                value = value.get(k, default)
+            else:
+                return default
+        return value