reestructure gradle config so modules can implement a base configuration

userlist/src/androidTest/java/com/hako/friendlist_userlist/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package com.hako.friendlist_userlist
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.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.hako.friendlist_userlist.test", appContext.packageName)
+    }
+}

userlist/src/main/AndroidManifest.xml

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

userlist/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">userlist</string>
+</resources>

userlist/src/test/java/com/hako/friendlist_userlist/ExampleUnitTest.kt

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+package com.hako.friendlist_userlist
+
+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)
+    }
+}