added android project and linked to engine source with successful compilation

android/build.gradle

@@ -0,0 +1,64 @@
+buildscript {
+    repositories {
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:2.2.0'
+    }
+}
+apply plugin: 'android'
+
+android {
+    compileSdkVersion 'android-19'
+    buildToolsVersion '24.0.3'
+
+    defaultConfig {
+        // This block is different from the one you use to link Gradle
+        // to your CMake or ndk-build script.
+        externalNativeBuild {
+            // For ndk-build, instead use the ndkBuild block
+            cmake {
+                // Passes optional arguments to CMake.
+                //arguments "-DANDROID_ARM_NEON=TRUE", "-DANDROID_TOOLCHAIN=clang"
+                // Sets optional flags for the C compiler.
+                //cFlags "-D_EXAMPLE_C_FLAG1", "-D_EXAMPLE_C_FLAG2"
+                // Sets a flag to enable format macro constants for the C++ compiler.
+                //cppFlags "-D__STDC_FORMAT_MACROS"
+                arguments '-DANDROID_PLATFORM=android-19',
+                    '-DANDROID_TOOLCHAIN=clang', '-DANDROID_STL=gnustl_static'
+            }
+        }
+        ndk {
+          // Specifies the ABI configurations of your native
+          // libraries Gradle should build and package with your APK.
+          // abiFilters 'x86', 'x86_64', 'armeabi', 'armeabi-v7a', 'arm64-v8a'
+          abiFilters 'armeabi-v7a'
+        }
+    }
+
+    // productFlavors {
+    //     main {
+    //         externalNativeBuild {
+    //             cmake {
+    //                 targets "native-lib-demo"
+    //             }
+    //         }
+    //     }
+    // }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFile getDefaultProguardFile('proguard-android.txt')
+        }
+    }
+
+      // Encapsulates your external native build configurations.
+    externalNativeBuild {
+        // Encapsulates your CMake build configurations.
+        cmake {
+          // Provides a relative path to your CMake build script.
+          path "CMakeLists.txt"
+        }
+    }
+}