Merge branch '3-add-add_option-function' into 'master'

Resolve "add add_option function"

Closes #3

See merge request Milka64/uHodor!2

esp8266/uConfigParser.py

@@ -18,6 +18,13 @@ class ConfigParser:
         else:
             return False
 
+    def add_option(self, section, option):
+        """Create a new option in the configuration."""
+        if self.has_section(section) and not option in self.config_dict[section]:
+            self.config_dict[section][option] = None
+        else:
+            raise
+
     def options(self, section):
         """Return a list of option names for the given section name."""
         if not section in self.config_dict: