Add logo_ASCII.py to display a gradient banner for PyRAG-Kit

- Implemented a function to create a horizontal color gradient for text.
- Utilized the pyfiglet library to generate a stylized text banner.
- Integrated the rich library for enhanced console output.
- Defined a blue-to-red gradient for the banner display.

Author: MisonL

README.md

@@ -1,8 +1,6 @@
 <div align="center">
 
-# PyRAG-Kit
-
-**Py**thon **R**etrieval-**A**ugmented **G**eneration **Kit**
+![Logo](imgs/logo.jpg)
 
 </div>
 
@@ -29,9 +27,7 @@
 
 ## 📸 程序截图
 
-*在这里可以添加一张程序运行时的截图，以更直观地展示其效果。*
-
-![image](https://github.com/user-attachments/assets/e479392b-86a1-45f6-809d-37f8c114513d)
+![Main Screenshot](imgs/main.jpg)
 
 
 ## 📂 项目结构

imgs/logo.jpg

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+from rich.console import Console
+from rich.text import Text
+import pyfiglet
+from typing import Tuple
+
+console = Console()
+
+def create_gradient(text: str, start_color: Tuple[int, int, int], end_color: Tuple[int, int, int]) -> Text:
+    """为文本创建从左到右的水平颜色渐变效果。"""
+    text_obj = Text()
+    total_length = len(text)
+    for i, char in enumerate(text):
+        r = int(start_color[0] + (end_color[0] - start_color[0]) * (i / max(1, total_length - 1)))
+        g = int(start_color[1] + (end_color[1] - start_color[1]) * (i / max(1, total_length - 1)))
+        b = int(start_color[2] + (end_color[2] - start_color[2]) * (i / max(1, total_length - 1)))
+        text_obj.append(char, style=f"rgb({r},{g},{b})")
+    return text_obj
+
+def display_banner():
+    """显示程序的启动横幅。"""
+    # 使用 'big' 字体
+    fig = pyfiglet.Figlet(font='big')
+    banner_text = fig.renderText('PyRAG-Kit')
+    
+    # 定义渐变色 (左蓝右红)
+    blue = (0, 0, 255)
+    red = (255, 0, 0)
+    
+    gradient_banner = create_gradient(banner_text, blue, red)
+    console.print(gradient_banner)
+
+if __name__ == "__main__":
+    display_banner()