Implemented Android Smart Card Emulator

Includes jCardSim to emulate the following Java Card Applets in
Android's host card emulation:

- jCardSim Team's Hello World Applet
- Philip Wendland's ISO Applet
- Yubico's OpenPGP Applet
- Yubico's OATH Applet

ACardEmulator/app/src/main/res/values/dimens.xml

@@ -0,0 +1,6 @@
+<resources>
+    <!-- Default screen margins, per the Android Design guidelines. -->
+    <dimen name="activity_horizontal_margin">16dp</dimen>
+    <dimen name="activity_vertical_margin">16dp</dimen>
+
+    </resources>