Add example notebook, low-frequency tracking docs and frames file.

Author: Will Morgan

README.md

@@ -8,16 +8,19 @@ StatsBomb are hoping that by making data freely available, we will extend the wi
 
 ## Terms & Conditions
 
-If you publish, share or distribute any research, analysis or insights based on this data, please state the data source as StatsBomb and use our logo, available in our [Media Pack](https://statsbomb.com/media-pack/). Please see the [`StatsBomb Public Data User Agreement`](./LICENSE.pdf) for further information regarding use of the data.
+If you publish, share or distribute any research, analysis or insights based on this data, please state the data source as StatsBomb and use our logo, available in our [Media Pack](https://statsbomb.com/media-pack/). Please see the [StatsBomb Public Data User Agreement](./LICENSE.pdf) for further information regarding use of the data.
 
 ## Getting Started
 
 The [data](./data/) is provided as CSV files exported from the StatsBomb Data API, in the following structure:
 
 * Play-level data stored in [`plays`](./data/plays/).
 * Event-level data stored in [`events`](./data/events/).
+* Frame-level data stored in [`frames`](./data/frames/). These can be accessed as individual files for each game with file names referred to by their `game_id` i.e. `lft_<GAME_ID>.csv` .
 
-Some documentation about the meaning of different variables and the format of the CSV files can be found in the [`doc`](./doc) directory.
+Some documentation about the meaning of different variables and the format of the files can be found in the [`doc`](./doc) directory.
+
+Examples of using the data can be found [here](./examples/).
 
 ## Careers