add a config for local testing, plus add mobile testing and some instructions

README.md

@@ -71,8 +71,22 @@ npm run build
 
 ### Automated
 
+At the test server:
 `npx playwright test`
 
+At the locally running server:
+... after clone and setup https://github.com/trentlarson/endorser-ch
+... and after you `npx playwright install chrome`
+... then run these:
+```
+# In the endorser-ch directory:
+NODE_ENV=test-local npm run dev
+
+# Here:
+npx playwright test -c playwright.config-local.ts
+```
+``
+
 ### Register new user on test server
 
 On the test server, User #0 has rights to register others, so you can start