Code refactor, support multiple gateways and non-SAML authentication (#9)

* Code refactor

* Update README.md

GPClient/gpgateway.cpp

@@ -0,0 +1,38 @@
+#include "gpgateway.h"
+
+GPGateway::GPGateway()
+{
+}
+
+QString GPGateway::name() const
+{
+    return _name;
+}
+
+QString GPGateway::address() const
+{
+    return _address;
+}
+
+void GPGateway::setName(const QString &name)
+{
+    _name = name;
+}
+
+void GPGateway::setAddress(const QString &address)
+{
+    _address = address;
+}
+
+void GPGateway::setPriorityRules(const QMap<QString, int> &priorityRules)
+{
+    _priorityRules = priorityRules;
+}
+
+int GPGateway::priorityOf(QString ruleName)
+{
+    if (_priorityRules.contains(ruleName)) {
+        return _priorityRules.value(ruleName);
+    }
+    return 0;
+}