feat: initialize K-Shrink workspace with multiple crates for image shrinking utility

- Add Cargo.toml for workspace configuration with dependencies.
- Create README.md with project description, usage, and architecture details.
- Implement `bin` crate for the main executable, including clipboard processing logic.
- Add `config` crate for handling configuration in TOML format.
- Develop `lib` crate containing core image processing logic and error handling.
- Introduce `platform` crate for platform-specific clipboard interactions, starting with Wayland.
- Implement tests for image shrinking functionality and clipboard interactions.

crates/lib/src/hash.rs

@@ -0,0 +1,29 @@
+use sha2::{Digest, Sha256};
+
+pub fn image_hash(data: &[u8]) -> [u8; 32] {
+    let mut hasher = Sha256::new();
+    hasher.update(data);
+    hasher.finalize().into()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn same_input_same_hash() {
+        let data = b"some image bytes";
+        assert_eq!(image_hash(data), image_hash(data));
+    }
+
+    #[test]
+    fn different_input_different_hash() {
+        assert_ne!(image_hash(b"abc"), image_hash(b"xyz"));
+    }
+
+    #[test]
+    fn empty_input_no_panic() {
+        let h = image_hash(b"");
+        assert_eq!(h.len(), 32);
+    }
+}