E2e readme docs (#14434)

* Updated README with improvements

* Fix table spacing

* remove argument from flag

Co-authored-by: Mark Stacey <markjstacey@gmail.com>

* Rephrased chrome version sentence

Co-authored-by: Mark Stacey <markjstacey@gmail.com>

Co-authored-by: Mark Stacey <markjstacey@gmail.com>
Co-authored-by: David Walsh <davidwalsh83@gmail.com>

README.md

@@ -60,9 +60,23 @@ You can run the linter by itself with `yarn lint`, and you can automatically fix
 
 Our e2e test suite can be run on either Firefox or Chrome. In either case, start by creating a test build by running `yarn build:test`.
 
-Firefox e2e tests can be run with `yarn test:e2e:firefox`.
+- Firefox e2e tests can be run with `yarn test:e2e:firefox`.
 
-Chrome e2e tests can be run with `yarn test:e2e:chrome`, but they will only work if you have Chrome v79 installed. Update the `chromedriver` package to a version matching your local Chrome installation to run e2e tests on newer Chrome versions.
+- Chrome e2e tests can be run with `yarn test:e2e:chrome`. The `chromedriver` package major version must match the major version of your local Chrome installation. If they don't match, update whichever is behind before running Chrome e2e tests.
+
+- Single e2e tests can be run with `yarn test:e2e:single test/e2e/tests/TEST_NAME.spec.js` along with the options below.
+
+```console
+--browser             Set the browser used; either 'chrome' or 'firefox'.
+
+--leave-running       Leaves the browser running after a test fails, along with anything else 
+                      that the test used (ganache, the test dapp, etc.).
+                      
+--retries             Set how many times the test should be retried upon failure. Default is 0.
+```
+
+An example for running `account-details` testcase with chrome and leaving the browser open would be:
+`yarn test:e2e:single test/e2e/tests/account-details.spec.js --browser=chrome --leave-running`
 
 ### Changing dependencies