Add write capability to `ConfigManager` using `tomli_w`

- Introduced `set_data_dict` method to update configuration data.
- Added `write_config` method to generate default config structure for writing.

src/metar_navigate/utils/config_manager.py

@@ -1,6 +1,7 @@
 import os.path
 
 import tomli
+import tomli_w
 
 from metar_navigate.utils import DirectoryManager
 
@@ -38,4 +39,18 @@ class ConfigManager(metaclass=SingletonMeta):
 
         else:
             return None
+    def set_data_dict(self,data):
+        self.__data.update(data)
+
+
+    def write_config(self):
+        default = {
+            "checkwx_api_key": "",
+            "always_show_detailed": False,
+            "wind_speed_unit": "Keep",
+            "temp_unit": "Keep",
+            "visibility_unit": "Keep",
+            "pressure_unit": "Keep"
+
+        }