docs: 添加 Readme

Author: share121

crates/fast-down/LICENSE

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+MIT License
+
+Copyright (c) 2025 share121
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

crates/fast-down/README.md

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+# fast-down
+
+[![GitHub last commit](https://img.shields.io/github/last-commit/fast-down/core/stable)](https://github.com/fast-down/core/commits/stable)
+[![Test](https://github.com/fast-down/core/workflows/Test/badge.svg)](https://github.com/fast-down/core/actions)
+[![Latest version](https://img.shields.io/crates/v/fast-down.svg)](https://crates.io/crates/fast-down)
+[![Documentation](https://docs.rs/fast-down/badge.svg)](https://docs.rs/fast-down)
+[![License](https://img.shields.io/crates/l/fast-down.svg)](https://github.com/fast-down/core/blob/stable/crates/fast-down/LICENSE)
+
+`fast-down` **Fastest** concurrent downloader!
+
+**[Official Website (Simplified Chinese)](https://fast.s121.top/)**
+
+## Features
+
+1. **⚡️ Fastest Download**  
+   We created [fast-steal](https://github.com/fast-down/fast-steal) With optimized Work Stealing, **1.43 x faster** than
+   NDM.
+2. **🔄 File consistency**  
+   Switching Wi-Fi, Turn Off Wi-Fi, Switch proxies. **We guarantee the consistency**.
+3. **⛓️‍💥 Resuming Downloads**  
+   You can **interrupt** at any time, and **resume downloading** after.
+4. **⛓️‍💥 Incremental Downloads**  
+   1000 more lines server logs? Don't worry, we **only download new lines**.
+5. **💰 Free and open-source**  
+   The code stays free and open-source. Thanks to [share121](https://github.com/share121), [Cyan](https://github.com/CyanChanges) and other fast-down contributors.