Update the docs

Author: mdmintz

README.md

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-[<img src="https://cdn2.hubspot.net/hubfs/100006/fancy_logo_8.png" title="SeleniumBase" align="center" height="38">](https://github.com/seleniumbase/SeleniumBase/blob/master/README.md)<br />
+[<img src="https://cdn2.hubspot.net/hubfs/100006/fancy_logo_9.png" title="SeleniumBase" align="center" height="38">](https://github.com/seleniumbase/SeleniumBase/blob/master/README.md)<br />
 
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help_docs/mobile_testing.md

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+[<img src="https://cdn2.hubspot.net/hubfs/100006/images/SeleniumBaseText_F.png" title="SeleniumBase" align="center" height="40">](https://github.com/seleniumbase/SeleniumBase/blob/master/README.md)
+## <img src="https://cdn2.hubspot.net/hubfs/100006/images/super_square_logo_3a.png" title="SeleniumBase" height="32"> Mobile Testing
+
+Use ``--mobile`` to run your SeleniumBase tests using Chrome's (or Edge's) mobile device emulator with default values for device metrics (CSS Width, CSS Height, Pixel-Ratio) and user agent.
+
+To configure the mobile device metrics, use ``--metrics="CSS_Width,CSS_Height,Pixel_Ratio"``. To configure the user agent, use ``--agent="USER-AGENT-STRING"``.
+
+To find real values for device metrics, [see this GitHub Gist](https://gist.github.com/sidferreira/3f5fad525e99b395d8bd882ee0fd9d00). For a list of available user agent strings, [check out this page](https://developers.whatismybrowser.com/useragents/explore/).
+
+--------
+
+Here's an example of running a mobile test (See https://github.com/seleniumbase/SeleniumBase/blob/master/examples/test_skype_site.py):
+
+```bash
+pytest test_skype_site.py --mobile --browser=edge
+```
+[<img src="https://cdn2.hubspot.net/hubfs/100006/images/skype_mobile_test_2.gif" title="SeleniumBase Mobile Testing">](https://cdn2.hubspot.net/hubfs/100006/images/skype_mobile_test_2.gif)
+
+
+--------
+
+Here's another example of running a mobile test (https://github.com/seleniumbase/SeleniumBase/blob/master/examples/test_swag_labs.py), which demonstrates using ``--metrics`` and ``--agent`` with ``--mobile``.:
+
+```bash
+# Run tests using Chrome's mobile device emulator (default settings)
+pytest test_swag_labs.py --mobile
+
+# Run mobile tests specifying CSS Width, CSS Height, and Pixel-Ratio
+pytest test_swag_labs.py --mobile --metrics="411,731,3"
+
+# Run mobile tests specifying the user agent
+pytest test_swag_labs.py --mobile --agent="Mozilla/5.0 (Linux; Android 9; Pixel 3 XL)"
+```
+[<img src="https://cdn2.hubspot.net/hubfs/100006/images/swag_labs_gif.gif" title="SeleniumBase Mobile Testing">](https://cdn2.hubspot.net/hubfs/100006/images/swag_labs_gif.gif)
+
+--------
+
+If you're new to SeleniumBase, read https://github.com/seleniumbase/SeleniumBase to help you get started.