feat(auth): add auth emulator snippets (#410)

Author: thatfiredev

auth/app/src/main/java/com/google/firebase/quickstart/auth/EmulatorSuite.java

@@ -0,0 +1,13 @@
+package com.google.firebase.quickstart.auth;
+
+import com.google.firebase.auth.FirebaseAuth;
+
+public class EmulatorSuite {
+    public void emulatorSettings() {
+        // [START auth_emulator_connect]
+        // 10.0.2.2 is the special IP address to connect to the 'localhost' of
+        // the host computer from an Android emulator.
+        FirebaseAuth.getInstance().useEmulator("10.0.2.2", 9099);
+        // [END auth_emulator_connect]
+    }
+}

auth/app/src/main/java/com/google/firebase/quickstart/auth/kotlin/EmulatorSuite.kt

@@ -0,0 +1,16 @@
+package com.google.firebase.quickstart.auth.kotlin
+
+import com.google.firebase.auth.ktx.auth
+import com.google.firebase.ktx.Firebase
+
+class EmulatorSuite {
+
+    fun emulatorSettings() {
+        // [START auth_emulator_connect]
+        // 10.0.2.2 is the special IP address to connect to the 'localhost' of
+        // the host computer from an Android emulator.
+        Firebase.auth.useEmulator("10.0.2.2", 9099)
+        // [END auth_emulator_connect]
+    }
+
+}