Improve README documentation with Quick Start guide (English & Japanese)

[Copilot]

Addresses Issue #22 requesting better "how to use" documentation. The English README was minimal compared to the Japanese version.

Changes

English README (README.md)

• Key Features section: Documents cell lifecycle types, multiple cell types, dynamic sizing, append/prepend, scroll-to-index
• Quick Start Guide: Step-by-step code examples for creating a table view
• Sample descriptions: Table documenting all 8 sample projects

Japanese README (README_jp.md)

• クイックスタートガイド: Step-by-step code examples with Japanese comments
• サンプル一覧: Table documenting all 8 sample projects in Japanese

Quick Start Example

public class SimpleTableScene : MonoBehaviour, IUITableViewDataSource, IUITableViewDelegate
{
    [SerializeField] UITableView _tableView;
    [SerializeField] SimpleCell _cellPrefab;

    void Start()
    {
        _tableView.dataSource = this;
        _tableView.@delegate = this;
        _tableView.ReloadData();
    }

    public UITableViewCell CellAtIndexInTableView(UITableView tableView, int index)
        => _tableView.ReuseOrCreateCell(_cellPrefab);

    public int NumberOfCellsInTableView(UITableView tableView) => 200;

    public float LengthForCellInTableView(UITableView tableView, int index)
        => index % 2 == 0 ? 150 : 200;
}

Original prompt

プルリクを作ってくれないかな？

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💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[zhaozilong1988]

@copilot 日本語にしてくれない？

[Copilot]

@copilot 日本語にしてくれない？

README_jp.mdにクイックスタートガイドとサンプル一覧を日本語で追加しました (efc0894)。