feat: add summary to readme.md

README.md

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 # AirPyllution
+A package for visualizing future, historic and current air pollution data using the (OpenWeather API)[https://openweathermap.org].
+
+## Summary
+This package enables users to explore air pollution levels in locations around the world.   
+Using the (Air Pollution API)[https://openweathermap.org/api/air-pollution], this package provides 3 functions that help to visualise present, future and historic air pollution data. 
+
+Using the OpenWeatherMap API requires sign up to gain access to an API key. The API key should be stored in the `config.py` file. (TO ADD)
+For more information about API call limits and API care recommendations please visit the OpenWeather (How to start)[https://openweathermap.org/appid] page.
+
+## Functions
+The functions are as follows:
+- `getPollutionLevels()`
+- `getHistoricData()`
+- `getPollutionForecast()`
+a summary paragraph that describes the project at a high level
+
+a bulleted list of the functions (and datasets if applicable) that will be included in the package (this should be a 1-2 sentence description for each function/dataset)
+
+a paragraph describing where your packages fit into the Python ecosystem (are there any other Python packages that have the same/similar functionality? Provide links to any that do. If none exist, then clearly state this as well).
+
 
-A package which  provides various functionalities on air pollution data.
 
 ## Installation