docs(issuance): add README and remove LICENSE reference

- Add README.md with package documentation including setup, build,
  test, and lint commands
- Remove LICENSE from package.json files array (consistent with
  majority of packages; root LICENSE covers monorepo)

Author: RembrandtK

packages/issuance/README.md

@@ -0,0 +1,56 @@
+# The Graph Issuance Contracts
+
+This package contains smart contracts for The Graph's issuance functionality.
+
+## Overview
+
+The issuance contracts handle token issuance mechanisms for The Graph protocol.
+
+## Development
+
+### Setup
+
+```bash
+# Install dependencies
+pnpm install
+
+# Build
+pnpm build
+
+# Test
+pnpm test
+```
+
+### Testing
+
+To run the tests:
+
+```bash
+pnpm test
+```
+
+For coverage:
+
+```bash
+pnpm test:coverage
+```
+
+### Linting
+
+To lint the contracts and tests:
+
+```bash
+pnpm lint
+```
+
+### Contract Size
+
+To check contract sizes:
+
+```bash
+pnpm size
+```
+
+## License
+
+GPL-2.0-or-later

packages/issuance/package.json

@@ -33,8 +33,7 @@
     "artifacts/**/*",
     "types/**/*",
     "contracts/**/*",
-    "README.md",
-    "LICENSE"
+    "README.md"
   ],
   "author": "The Graph Team",
   "license": "GPL-2.0-or-later",