[docs] add skeletons for task descriptions

docs/auditory_task.md

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+# Auditory reaction times
+

docs/index.md

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 # BlipBlop
 
-Tiny tool for measuring reaction times upon auditory or visual stimuli.
+Tiny tool for measuring reaction times upon auditory or visual stimulation. This tool is open-source. The source code can be found on [GitHub](https://github.com/jgrewe/blipblop). It is published under the MIT open source [license](license.md). 
+Auditory stimuli have been taken from the freedesktop system sounds [freedesktop](https://freedesktop.org)
+
+The main window has three views:
+
+## Visual task
+
+Measure reaction times to a visual stimulus that pops in the center of the screen. ([more](qrc:/docs/visual_task))
+
+## Auditory task
+
+Measure reaction times to a auditory stimulus. ([more](qrc:/docs/auditory_task))
+
+## Results View
+
+A simple tablular view that shows the measured reaction times. The data is given in seconds. Select the data and press (**ctrl+c** or **cmd+c**) to copy the selection to clipboard and paste it into your favorite spreadsheet tool for further analysis.
+
 

docs/license.md

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+#License

docs/visual_task.md

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+# Visual reaction times
+