added things example and irext driver project

things-example/app/src/androidTest/java/net/irext/irext_things/ExampleInstrumentedTest.java

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+package net.irext.irext_things;
+
+import android.content.Context;
+import android.support.test.InstrumentationRegistry;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() throws Exception {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getTargetContext();
+
+        assertEquals("net.irext.irext_things", appContext.getPackageName());
+    }
+}

things-example/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="net.irext.irext_things">
+
+    <application>
+        <uses-library android:name="com.google.android.things" />
+
+        <activity android:name=".MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.IOT_LAUNCHER" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

things-example/app/src/main/java/net/irext/irext_things/MainActivity.java

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+package net.irext.irext_things;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+/**
+ * Skeleton of an Android Things activity.
+ * <p>
+ * Android Things peripheral APIs are accessible through the class
+ * PeripheralManagerService. For example, the snippet below will open a GPIO pin and
+ * set it to HIGH:
+ * <p>
+ * <pre>{@code
+ * PeripheralManagerService service = new PeripheralManagerService();
+ * mLedGpio = service.openGpio("BCM6");
+ * mLedGpio.setDirection(Gpio.DIRECTION_OUT_INITIALLY_LOW);
+ * mLedGpio.setValue(true);
+ * }</pre>
+ * <p>
+ * For more complex peripherals, look for an existing user-space driver, or implement one if none
+ * is available.
+ *
+ * @see <a href="https://github.com/androidthings/contrib-drivers#readme">https://github.com/androidthings/contrib-drivers#readme</a>
+ */
+public class MainActivity extends Activity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+    }
+}

things-example/app/src/main/res/layout/activity_main.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context="net.irext.irext_things.MainActivity">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</android.support.constraint.ConstraintLayout>

things-example/app/src/main/res/values/colors.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="colorPrimary">#3F51B5</color>
+    <color name="colorPrimaryDark">#303F9F</color>
+    <color name="colorAccent">#FF4081</color>
+</resources>

things-example/app/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">IREXT-Things</string>
+</resources>

things-example/app/src/main/res/values/styles.xml

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+<resources>
+
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="android:Theme.Material.Light.DarkActionBar" />
+
+</resources>

things-example/app/src/test/java/net/irext/irext_things/ExampleUnitTest.java

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+package net.irext.irext_things;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+public class ExampleUnitTest {
+    @Test
+    public void addition_isCorrect() throws Exception {
+        assertEquals(4, 2 + 2);
+    }
+}