Added methods to change context

Added

• Added comments to config file;
• Added timely_app_t *current_app pointer to store the opened app;
• Added methods to change context;
• Added style to watchface fonts;
• Added functions to manage the applications;

Fixed

• Fixed typo in weather app;

Changed

• Changed weather stock application by adding name and description labels;
• Renamed timely_main to timely_watchface;
• Renamed timely_setup to timely_launcher;

Removed

• Removed unused event handler function;

Project skeleton crated with weather stock app to test

Added

• Added README.md file with basic informations;
• Added .gitignore file to ignore C output files;
• Added LICENCE file with GPL3+ licence;
• Added CMakeLists.txt file;
• Added timely.mk make file;
• Added a simple tileview with the desired ui layout;
• Added lock screen prototype;
• Added weather and missed notifications to main tile;
• Added 48x48 pixels weather cloudy sun icon;
• Added weather data types based on OpenWeatherMap;
• Added script to download openweathermap weather icons on scripts folder;
• Added all OpenWeatherMap icons with 50x50, 100x100 and 200x200 pixels on resources/icons folder;
• Added timely_app_t struct with attributes and methods to initialize an app;
• Added a demo gif to README.md;
• Added a stock weather app;
• Added CONTRIBUTING file;
• Added CODE_OF_CONDUCT file;
• Added issue and pull request templates;

Fixed

• Fixed labels misalignment;

Changed

• Updated lock screen and added click event;