chore: add tag repository in package.json

Author: isakruas

package.json

@@ -2,6 +2,7 @@
   "name": "js-ecutils",
   "version": "0.0.1-alpha.1",
   "description": "JavaScript library for Elliptic Curve Cryptography: key exchanges (Diffie-Hellman, Massey-Omura), ECDSA signatures, and Koblitz encoding. Suitable for crypto education and secure systems.",
+  "repository":"https://github.com/isakruas/js-ecutils",
   "keywords": [
     "ecdsa",
     "secure-communication",