fix: add publish and resolve

Adds publish & resolve methods.
Updates example app.
Add npmignore.
Bumps version to 0.3.0.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@synonymdev/react-native-pubky",
-  "version": "0.2.3",
+  "version": "0.3.0",
   "description": "React Native Implementation of Pubky",
   "source": "./src/index.tsx",
   "main": "./lib/commonjs/index.js",