added available material list to README

README

@@ -10,3 +10,13 @@ Afterwards, to download only the new commits, from the NOS_public folder type on
 $ git pull origin master
 
 This should be enough for the needs of the course.
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+
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+Material made available until now:
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+Lectures number 1, 2
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+Exercises number 1, 2
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+Solutions number