Added Android NDK build folders for MRTs sample (chapter 11)

NOTE: This sample is currently not working on Nexus 4 probably due to some issue with that device. It is still to be verified whether it works on any other Android device. 
It works fine with ARM Emulator v 1.3 and Adreno Emulator v 3.4.

Chapter_11/MRTs/Android/AndroidManifest.xml

@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
+    package="com.openglesbook.MRTs">
+    <application
+        android:label="MRTs"
+        android:hasCode="false">
+         <activity android:name="android.app.NativeActivity"
+                android:label="MRTs"
+                android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+                android:launchMode="singleTask"
+                android:configChanges="orientation|keyboardHidden">
+            <meta-data android:name="android.app.lib_name" 
+                android:value="MRTs" />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+    <uses-feature android:glEsVersion="0x00030000"/>
+    <uses-sdk android:minSdkVersion="18"/>
+</manifest>

Chapter_11/MRTs/Android/jni/Android.mk

@@ -0,0 +1,32 @@
+LOCAL_PATH			:= $(call my-dir)
+SRC_PATH			:= ../..
+COMMON_PATH			:= $(SRC_PATH)/../../Common
+COMMON_INC_PATH		:= $(COMMON_PATH)/Include
+COMMON_SRC_PATH		:= $(COMMON_PATH)/Source
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE    := MRTs
+LOCAL_CFLAGS    += -DANDROID
+
+
+LOCAL_SRC_FILES := $(COMMON_SRC_PATH)/esShader.c \
+				   $(COMMON_SRC_PATH)/esShapes.c \
+				   $(COMMON_SRC_PATH)/esTransform.c \
+				   $(COMMON_SRC_PATH)/esUtil.c \
+				   $(COMMON_SRC_PATH)/Android/esUtil_Android.c \
+				   $(SRC_PATH)/MRTs.c
+
+
+
+
+LOCAL_C_INCLUDES	:= $(SRC_PATH) \
+					   $(COMMON_INC_PATH)
+
+LOCAL_LDLIBS    := -llog -landroid -lEGL -lGLESv3
+
+LOCAL_STATIC_LIBRARIES := android_native_app_glue
+
+include $(BUILD_SHARED_LIBRARY)
+
+$(call import-module,android/native_app_glue)

Chapter_11/MRTs/Android/jni/Application.mk

@@ -0,0 +1 @@
+APP_PLATFORM := android-18