add description for tasks

practica/stepik/README.md

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+# Course tasks#
+
+different tasks from various courses
+
+***[Beneficial features](beneficial_features)*** -  beneficial features which you can use for mathematic and statistic tasks
+- [Dictionaries and lists](beneficial_features/dictionaries_and_lists.py) - some of the properties of dictionaries and lists
+- [Double](stepik/beneficial_features/double.py) - how to find/delete double numbers/letters on a input line
+- [Indentation](beneficial_features/indentation.py) - some of features to do indentation 
+- [Index](beneficial_features/index.py) - some of features of index
+- [Input](beneficial_features/input.py) - some of features of input. function 
+
+ ***[Sketches](sketches)*** - here you can find various of sketches  unfinished\ unsuitable project 
+
+- [Sketches](sketches/sketches.py) - there are fail code here
+
+ ***[Stepik tasks](stepik_tasks)*** - here you can find done tasks from stepik courses. Details here: [README](stepik_tasks/README.md)
+
+- [10_pass_100_break](stepik_tasks/10_pass_100_break.py) 
+- [counting_numbers](stepik_tasks/counting_numbers.py)
+- [Geometric figures](stepik_tasks/geometric_figures.py) 
+- [intervals](stepik_tasks/intervals.py )
+- [percentage_of_letters](stepik_tasks/percentage_of_letters.py)
+- [Pie](stepik_tasks/pie.py)
+- [programmer_names](stepik_tasks/programmer_names.py)
+- [sum_num_from_last](stepik_tasks/sum_num_from_last.py)
+- [sum_num_nearby](stepik_tasks/sum_num_nearby.py)
+- [Tickets](stepik_tasks/tickets.py)
+  
+