made changes in README.md file

[5usu]

I made the following changes to the README file:

Added a New Section: Qualitative Examples
Introduced a new section titled "Qualitative Examples" to provide practical examples of how the LSTM-based model performs in comparison to the Dictionary model for Thai word segmentation.

Included four examples: "Oxford," "Kingdom of Kushan," "Impact," and "Land of Assam."
Each example includes the segmented text from both the Dictionary and LSTM models, along with a brief explanation of the differences and the preferred segmentation.

Updated the Table of Contents
Added a link to the "Qualitative Examples" section in the table of contents to ensure it is easily accessible.

Enhanced Readability
Improved the formatting of the examples to make them more readable and visually appealing.