Add NFC payment "how it works" screens.

Bug: 21239081
Bug: 21305138
Bug: 21305420
Change-Id: Ic9ea1b7e9b842299f2fb6b26f61a927855981e67

src/com/android/settings/nfc/HowItWorks.java

@@ -0,0 +1,30 @@
+package com.android.settings.nfc;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+
+import com.android.settings.R;
+public class HowItWorks extends Activity {
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.nfc_payment_how_it_works);
+        getActionBar().setDisplayHomeAsUpEnabled(true);
+        Button gotIt = (Button) findViewById(R.id.nfc_how_it_works_button);
+        gotIt.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+               finish();
+            }
+        });
+    }
+
+    @Override
+    public boolean onNavigateUp() {
+        finish();
+        return true;
+    }
+
+}