Merge pull request #89 from iden3/feature/android

added missing files

android/gradle.properties

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+android.enableJetifier=true
+android.useAndroidX=true

android/iden3coreapi/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.iden3.iden3coreapi" />

android/iden3coreapi/src/main/androidTest/java/com/iden3/iden3coreapi/ExampleInstrumentedTest.kt

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+package com.iden3.iden3coreapi
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.iden3.iden3coreapi.test", appContext.packageName)
+    }
+}

android/iden3coreapi/src/main/java/com/iden3/iden3coreapi/Iden3CoreAPI.kt

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+package com.iden3.iden3coreapi
+
+class Iden3CoreAPI {
+    companion object {
+        @JvmStatic lateinit var instance: Iden3CoreAPI
+    }
+
+    init {
+        instance = this
+    }
+}

android/iden3coreapi/src/main/test/java/com/iden3/iden3coreapi/ExampleUnitTest.kt

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+package com.iden3.iden3coreapi
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}

android/settings.gradle

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+include ':iden3coreapi'