Update README.md

Add data field description

README.md

@@ -100,3 +100,16 @@ This dataset contains information about repos (initially gathered from https://s
 You can find all scripts to reproduce dataset collection in our [GitHub ](https://github.com/JetBrains-Research/agents-eval) repository 
 
 ## Final Dataset Description
+
+|     **Field**      |             **Description**              |
+|:------------------:|:----------------------------------------:|
+|    `id`    | Identifier of data point.            |
+|    `repo_owner`    |            Bug issue repository owner.            |
+|    `repo_name`    |            Bug issue repository name.            |
+|    `html_url`      |       GitHub link to issue <br> `https://github.com/{repo_owner}/{repo_name}`.       |
+|    `is_template`      |       True if the repositories marked as a template, otherwise False.       |
+|    `description`      |       Repository description.       |
+|    `template_keywords`       | Template-related keywords.  |
+|    `license`       | Repository license <br> (one from 'MIT License', 'Apache License 2.0', <br> 'BSD 3-Clause "New" or "Revised" License', 'BSD 2-Clause "Simplified" License').  |
+|    `topics`       | Repository topics.    |
+|    `size`        | Repo size \[MB\].  |