Merge branch 'main' into exercise/completed

Author: tboychuk

3-0-java-core/src/main/java/com/bobocode/file_reader/README.MD

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+# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>File Reader exercise :muscle:
+Improve your Java SE and Clean Code skills
+### Task
+`FileReaders` is an API that allows you to read whole file content into a `String`. Your job is to 
+implement the *todo* section of that class.
+
+### Refactoring Task
+There is an dirty implementation of class `FileReaders` that **contains bad practices and code smells**. If you want to 
+practice in **refactoring** and improve your **clean code skills** you can start from branch **exercise/dirty** instead of 
+**master** and try to refactor existing implementation.
+  
+To verify your implementation, run `FileReadersTest.java`
+ 
+### Pre-conditions :heavy_exclamation_mark:
+You're supposed to know how to work with text files and be able to write Java code
+
+### How to start :question:
+* Just clone the repository and create a branch **exercise/your_username** if you want your code to be reviewed
+* Start implementing the **todo** section and verify your changes by running tests
+* If you don't have enough knowledge about this domain, check out the [links below](#related-materials-information_source)
+* Don't worry if you got stuck, checkout the **exercise/completed** branch and see the final implementation
+ 
+### Related materials :information_source:
+ * [Stream API tutorial](https://github.com/bobocode-projects/java-functional-features-tutorial/tree/master/stream-api)
+