Create learning.md

Add the draft of learning page.

Signed-off-by: Jan Petr <j.petr@hzdr.de>

Author: jan-petr

docs/learning.md

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+# Learning
+
+OSIPI offers additional resources for continuous learning. 
+
+Video tutorials on the basics of ASL and advanced ASL concepts are available [here](https://youtube.com/playlist?list=PLTIlnXdb9rwhoO8afyba3GQSh8ueShJ03&si=rTJUBVXftFicno3j).
+
+A collection of recommended literature is available for [ASL](aslliterature.md), [DSC](dscliterature.md), and [DCE](dceliterature.md).
+
+Basic principles of MRI acquisition, processing, and clinical application, as well as advanced lectures on quantitative MRI are available
+at the YouTube channel of the TACTIX project: [TACTIX MRI Tutorials](https://www.youtube.com/@TACTIXTwinningProject/playlists).