feat: nudge npm users to star the repo (CLI + README + funding) (#49)

- CLI prints a star CTA after a successful install and in --help
- README adds a prominent star line below the badges (npm renders this)
- package.json gains a funding field so npm shows a Fund/Star link


Claude-Session: https://claude.ai/code/session_016JWn5jRD5tcEFKrubjQ6Px

Co-authored-by: Claude <noreply@anthropic.com>

package.json

@@ -29,6 +29,10 @@
   "bugs": {
     "url": "https://github.com/mohitagw15856/pm-claude-skills/issues"
   },
+  "funding": {
+    "type": "github",
+    "url": "https://github.com/mohitagw15856/pm-claude-skills"
+  },
   "author": "Mohit Aggarwal",
   "bin": {
     "pm-claude-skills": "bin/cli.mjs",