Adds android example using jni.

examples/cross_calculator/android/AndroidManifest.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+		package="com.github.nimrod.crosscalculator"
+		android:versionCode="1"
+		android:versionName="1.0">
+
+	<uses-sdk android:minSdkVersion="3" />
+
+	<application android:label="@string/app_name" android:debuggable="true">
+		<activity android:name=".CrossCalculator"
+			android:label="@string/app_name">
+			<intent-filter>
+				<action android:name="android.intent.action.MAIN" />
+				<category android:name="android.intent.category.LAUNCHER" />
+			</intent-filter>
+		</activity>
+	</application>
+</manifest>