Update README.md

Author: talgat-ruby

README.md

@@ -1,33 +1,57 @@
 # Codility Lessons - Javascript
 
+## References
+
+- [Installation](#installation)
+- [Test](#test)
+- [Description](#description)
+- [Solutions](#solutions)
+  - [Lesson 1 - Iterations](#s_1)
+    - [Binary Gap](#s_1_binary_gap)
+- Licence
+
+<a name="installation"></a>
+
 ## Installation
 
     $ npm install
 
+<a name="test"></a>
+
 ## Test
 
 Using [jest](https://jestjs.io/)
 
     $ npm test
 
+<a name="description"></a>
+
 ## Description
 
 Solutions for [codility lessons](https://app.codility.com/programmers/lessons) in javascript. Please feel free to contribute.
 
-## Existing Ones
+<a name="solutions"></a>
+
+## Solutions
+
+<a name="s_1"></a>
 
 ### Lesson 1 - Iterations
 
+<a name="s_1_binary_gap"></a>
+
 #### Binary Gap
 
-##### Solution
+##### File
 
 https://github.com/talgat-ruby/codility-lessons-javascript/blob/master/lesson1_iterations/BinaryGap.js
 
 ##### Link to Report
 
 https://app.codility.com/demo/results/trainingF5WJ2W-P96/
 
+<a name="licence"></a>
+
 ## License
 
 MIT