[Issue #37]: e2e docs update (#49)

## Summary
Fixes #37 


## Changes proposed
- add e2e docs prereq api command

frontend/README.md

@@ -135,6 +135,7 @@ E2E test filenames end with `.spec.ts` and are found in the `tests/e2e` director
 
 To run E2E tests via CLI:
 
+- `cd ../api && make init db-seed-local start` (prerequisite to start the API)
 - `npx playwright install --with-deps` — Downloads playwright browsers required to run tests
 - `npm run test:e2e` — Runs all E2E tests using the playwright config found at `tests/playwright.config.ts`
 - `npm run test:e2e:ui` — Run specific or all E2E tests using Playwright's [UI mode](https://playwright.dev/docs/test-ui-mode), which is useful for debugging full traces of each test