Add README to examples

Author: metaodi

examples/README.md

@@ -0,0 +1,13 @@
+Examples
+========
+
+The examples in this directory make use of `.env` files to specify the username and password for a user.
+
+You can either create a `.env` file (here or in the root of the repository) like this:
+
+```bash
+MP_USER=my_username
+MP_PASS=supersecretpassword
+```
+
+...or simply provide those values as environment variables.