docs: add useful links

Author: MikhailMasny

README.md

@@ -1,3 +1,22 @@
 # JavaScript tutorials
 
-The main idea of this repository is to teach the basic principles of working with JavaScript using practical examples. These examples contain all the features of ES6+, use Babel, and much more.
+The main idea of this repository is to teach the basic principles of working with JavaScript using practical examples. These examples contain all the features of ES6+, use Babel, and much more.
+
+## Useful links
+
+- [String](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String)
+- [Number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)
+- [Numbers and Dates](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Numbers_and_dates)
+- [Math](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math)
+- [Array](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)
+- [Date](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date)
+- [Regular Expressions](https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions)
+- [Object initializer](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Object_initializer)
+- [Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)
+- [Promise](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise)
+- [Control flow and error handling](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Control_flow_and_error_handling)
+- [Loops and iteration](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration)
+- [Functions](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Functions)
+- [Function object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function)
+- [Arguments](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments)
+- [Closures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures)