docs: add changeset

Author: solidsnakedev

.changeset/yummy-shoes-double.md

@@ -0,0 +1,26 @@
+---
+"@evolution-sdk/evolution": patch
+---
+
+Add `attachMetadata()` operation to TransactionBuilder for attaching transaction metadata according to CIP-10 standard.
+
+**Changes:**
+- Added `attachMetadata()` method to attach metadata with custom labels
+- Metadata labels are now bigint (unbounded positive integers) supporting CIP-20 messages (label 674) and custom labels
+- Automatic computation of auxiliaryDataHash in transaction body when metadata is present
+- Proper fee calculation accounting for auxiliary data size
+- TransactionMetadatum refactored to simple union type: `string | bigint | Uint8Array | Map | Array`
+- Added `NonNegativeInteger` schema to Numeric module for unbounded non-negative integers
+
+**Example:**
+```typescript
+await client
+  .newTx()
+  .attachMetadata({
+    label: 674n,  // CIP-20 message label
+    metadata: "Hello Cardano!"
+  })
+  .payToAddress({ address, assets })
+  .build()
+  .then(tx => tx.sign().submit())
+```