added -- README.md

Author: Ikboljon Abdurasulov

README.md

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+# MY [LEETCODE](https://leetcode.com/ikboljonme/) SOLUTION
+
+This repo contains my solutions to various LeetCode problems, along with explanations and Jest test cases.
+
+## Problem Solutions
+
+For each problem, you can find a JavaScript file containing my solution and a link to an explanation of the code. I have tried to write clear and concise code that is easy to understand, and I have provided explanations to help you understand my thought process and approach to the problem.
+
+## Jest Testcases
+
+To ensure the correctness of my solutions, I have included Jest test cases for each problem. These tests cover various edge cases and input scenarios to help verify that my solution is working correctly.
+
+## Usage
+
+Before running the tests, make sure to download all the required packages by running **npm install** command in the terminal.
+
+```
+npm install
+```
+
+To run all the Jest test cases, simply run **npm test** in the terminal. This will execute all the tests in the repository.
+
+```
+npm test
+```
+
+If you want to run tests for a specific problem, you can specify the file path of the test using the --PATH option. For example, to run tests for a problem located in the problems/foo.js file, **run npm test -- problems/foo.test.js**.
+
+```
+npm test -- problems/foo.test.js
+```
+
+- [Javascript](https://github.com/IkboljonMe/leetcode/tree/main/JavaScript)
+  - [50_day_Marathon](https://github.com/IkboljonMe/leetcode/tree/main/JavaScript/50days_marathon)