Support custom parameters (#76)

* Add the setting icon

* Add support for custom parameters

* Ignore auto generated files

* Update README.md

GPClient/settingsdialog.cpp

@@ -0,0 +1,26 @@
+#include "settingsdialog.h"
+#include "ui_settingsdialog.h"
+
+SettingsDialog::SettingsDialog(QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::SettingsDialog)
+{
+    ui->setupUi(this);
+
+    ui->extraArgsInput->setPlaceholderText("e.g. --name=value");
+}
+
+SettingsDialog::~SettingsDialog()
+{
+    delete ui;
+}
+
+void SettingsDialog::setExtraArgs(QString args)
+{
+    ui->extraArgsInput->setPlainText(args);
+}
+
+QString SettingsDialog::extraArgs()
+{
+    return ui->extraArgsInput->toPlainText().trimmed();
+}