Add doc about enabling SSL and basic auth

This addresses part of issue #432.
The pkcs12 files format allows for many certs to be included so it's generally a good idea to name (`-name marathon`) the entry when adding to it. This will then be used when creating the keystore to allow the selection of the specific cert set (using `-srcalias marathon`).

Also if the user is creating the pkcs12 file with a cert from a trusted CA they will need to specify the following arguments as well:
```
-chain -CAFile "trustedCA.crt"
```

The password can be bound into an environment variable (`$pass`) and then accessed with using 
```
-password "pass:$pass"
```