document dynamic data retrieval & CSV/JSON data upload with a minimal example

[michael-franke]

• start from the minimal template
• it now reads its input data for main and practice trials from *.js files in folder trial_info
• the new example should specify the same information but use the new functionality of the server app
• concretely, let’s supply the info in main_trial.js by uploading it as a csv file, and the info in practice_trials.js by uploading it as a JSON file
• include the files main_trial.csv and practice_trial.json in the new project’s ‘trial_order’ folder
• include a new view at the end of the experiment which shows some information about the previous runs, e.g., how many times which option was selected in the main trials
• so, make the response variable dynamically retrievable and include in this I/O example the functionality to read the previous responses back in

[x-ji]

The repo is created at https://github.com/babe-project/DynamicDataTemplate. Maybe you'd also want to take a look to confirm it is what's expected and change some wordings in the README.