Feat/import gdrp data (#26)

* Some simple code for extracting data from the jsons

* Jupiter Notebook

* Mac specific gitignore

* Fixed finding paths to floders

* Delete src/gdpr_data directory

* Updated gitignore to include my testing file

* Added the standard saving path for the database in the database handler, this way multiple files dont have to be updated when moving database position

* Moved the API usage wrappers into an own file, added a function for getting multiple track_ids at once, this still needs to be tested more

* Further code for extracting data from the gdpr files

* Forgor

* Final&Tested version of get_multiple_tracks_information endpoint

* Further functionality: The code now extracts the id of each listened song and makes a api call to get info about these songs via the multiple tracks api. Furthermore we track the songs witch the call is made for already and skip these

* Added function to map catalouged ids into the play history

* Added args parser to runtime program, cleaned up some code

* Fixed a bug where the database would always try to create tables, eaven if it exists

* Added some small text for clean interface

* Some final fixes to actual code, fixed db bug, reversed the order of database entries

* Some documentation

* Added -export args to docker runtime

* fix

README.md

@@ -47,6 +47,10 @@ docker run \
     predictify:unstable
 ```
 
+## GDPR Data
+
+If you have gdpr data, create a folder: ```data/gdpr_data``` and add all .json files containing your play history into it. In order to extract it, run the script: ```python3 src/runtime.py --export```
+
 ## Authors
 
 [Chris Kiriakou](https://github.com/ckiri)