Create README.MD

Author: Taras

math-functions/README.MD

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+# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>Math functions exercise :muscle:
+Improve your lambda and method reference skills
+### Task
+**FunctionMap** is an API that allows you to store and retrieve math functions by string name. Your job is to implement the *todo* section of `Functions.java` class using **Lambda expressions and method reference**, so all tests in `FunctionsTest.java` should pass
+ 
+### Pre-conditions :heavy_exclamation_mark:
+You're supposed to be familiar with Java 8
+
+### How to start :question:
+* Just clone the repository and start implementing the **todo** section, verify your changes by running tests
+* If you don't have enough knowladge about this domain, check out the [links below](#related-materials-information_source)
+* Don't worry if you got stuck, checkout the [exercise/completed](https://github.com/bobocode-projects/tdd-exercises/tree/exercise/completed/binary-search-tree) branch and see the final implementation
+ 
+### Related materials :information_source:
+ * [Lambda tutorial](https://github.com/bobocode-projects/java-8-tutorial/tree/master/lambdas) <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=20/>
+ * [State of lambda (JSR 335)](http://htmlpreview.github.io/?https://github.com/bobocode-projects/resources/blob/master/java8/lambda/sotl.html)
+