docs: populate README

README.md

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+# suck
+
+<div align="center">
+
+[![Crates.io](https://img.shields.io/crates/v/suck.svg)](https://crates.io/crates/suck)
+[![Github Actions](https://img.shields.io/github/actions/workflow/status/callumio/suck/ci.yml?branch=main)](https://github.com/callumio/suck/actions?workflow=ci)
+[![Documentation](https://docs.rs/suck/badge.svg)](https://docs.rs/suck)
+[![License](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
+
+</div>
+
+Suck data up through a channel
+
+## Features
+
+- Pull-based communication: Consumers request values on-demand
+- Contextual values: Designed for current state rather than event streams
+- Flexible sources: Support both static values and dynamic closures
+
+## Installation
+
+Add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+suck = "*"
+```
+
+## Quick Start
+
+```rust
+use suck::SuckPair;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Create a pair
+    let (sucker, sourcer) = SuckPair::<i32>::pair();
+
+    // Start producer in a thread
+    let producer = std::thread::spawn(move || {
+        // Set a static value
+        sourcer.set_static(42).unwrap();
+
+        // Or set a dynamic closure
+        sourcer.set(|| {
+            // Generate fresh values each time
+            42 * 2
+        }).unwrap();
+
+        // Run the producer loop
+        sourcer.run().unwrap();
+    });
+
+    // Consumer pulls values
+    let value = sucker.get()?;
+    println!("Got value: {}", value);
+
+    // Clean up
+    sucker.close()?;
+    producer.join().unwrap();
+
+    Ok(())
+}
+```
+
+## Contributing
+
+Contributions are welcome! Please feel free to submit a Pull Request.
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file
+for details.