chore: added README to example directory (#865)

* Added README to example directory to help bring clarity to developers new to the platform that re testing functionality

* updated from port 3000 to 30000 in docs, and added small editorial fixes for clarity

Author: mikedeshazer

example/README.md

@@ -0,0 +1,10 @@
+## <a name="example"></a> Example Application
+
+You can quickly run and interact with the example code in this directory. You run the example with the following commands:
+
+```bash
+$ npm ci
+$ npm run example:start
+```
+
+This runs a simple server at `http://localhost:30000/` that serves the static `example/index.html` file. This allows it easily interact with Metamask. You can edit the `example/index.html` file to try different code.