Rename project to Brachnha Insights

- Updated package.json name field
- Created proper README with project description
- Updated BMAD configuration

Co-Authored-By: Claude <noreply@anthropic.com>

package.json

@@ -1,5 +1,5 @@
 {
-  "name": "temp-app",
+  "name": "brachnha-insights",
   "version": "0.1.0",
   "private": true,
   "scripts": {