Add mingling crate with core re-export and documentation

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+# Mìng Lìng - 命令
+
+> [!WARNING]
+>
+> **Note**: Mingling is still under active development, and its API may change. Feel free to try it out and give us feedback!
+
+`Mingling` is a Rust command-line framework. Its name comes from the Chinese Pinyin for "命令", which means "Command".
+
+## Quick Start
+
+The example below shows how to use `Mingling` to create a simple command-line program:
+
+```rust
+use mingling::{
+    hint::NoDispatcherFound,
+    macros::{dispatcher, program, r_println, renderer},
+};
+
+#[tokio::main]
+async fn main() {
+    let mut program = MyProgram::new();
+    program.with_dispatcher(HelloCommand);
+    program.exec().await;
+}
+
+dispatcher!("hello", HelloCommand => HelloEntry);
+
+#[renderer]
+pub fn render_hello(_prev: HelloEntry) {
+    r_println!("Hello, World!")
+}
+
+#[renderer]
+pub fn render_no_dispatcher_found(prev: NoDispatcherFound) {
+    r_println!("Subcommand not found: '{}'", prev.args.join(", "))
+}
+
+program!(MyProgram);
+```
+
+Output:
+
+```
+> mycmd hello
+Hello, World!
+> mycmd hallo
+Subcommand not found: 'mycmd hallo'
+```
+
+## Core Concepts
+
+Mingling abstracts command execution into the following parts:
+
+1. **Dispatcher** - Routes user input to a specific renderer or chain based on the command node name.
+2. **Chain** - Transforms the incoming type into another type, passing it to the next chain or renderer.
+3. **Renderer** - Stops the chain and prints the currently processed type to the terminal.
+4. **Program** - Manages the lifecycle and configuration of the entire CLI application.
+
+## Project Structure
+
+The Mingling project consists of two main parts:
+
+- **[mingling/](mingling/)** - The core runtime library, containing type definitions, error handling, and basic functionality.
+- **[mingling_macros/](mingling_macros/)** - The procedural macro library, providing declarative macros to simplify development.
+
+## License
+
+This project is licensed under the MIT License. 
+
+See [LICENSE-MIT](LICENSE-MIT) or [LICENSE-APACHE](LICENSE-APACHE) file for details.