1. Updated 'auth-user-pass' to read login credentials from a file

2. Updated 'ca', 'cert', 'key' and 'tls-cert' to read from files to simplify future maintenance
3. Added default.ovpn pointing to United-Kingdom.ovpn
4. Updated README to include IronSocket in the list of supported providers

Original OVPN files sourced directly from IronSocket at https://ironsocket.com/network#ovpn

openvpn/ironsocket/cert.crt

@@ -0,0 +1,42 @@
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----