BIT-1293: add autofill service shell (#468)

app/src/main/java/com/x8bit/bitwarden/autofill/BitwardenAutofillService.kt

@@ -0,0 +1,31 @@
+package com.x8bit.bitwarden.autofill
+
+import android.os.CancellationSignal
+import android.service.autofill.AutofillService
+import android.service.autofill.FillCallback
+import android.service.autofill.FillRequest
+import android.service.autofill.SaveCallback
+import android.service.autofill.SaveRequest
+import dagger.hilt.android.AndroidEntryPoint
+
+/**
+ * The [AutofillService] implementation for the app. This fulfills autofill requests from other
+ * applications.
+ */
+@AndroidEntryPoint
+class BitwardenAutofillService : AutofillService() {
+    override fun onFillRequest(
+        request: FillRequest,
+        cancellationSignal: CancellationSignal,
+        fillCallback: FillCallback,
+    ) {
+        // TODO: parse request and perform dummy autofill (BIT-1314)
+    }
+
+    override fun onSaveRequest(
+        saverRequest: SaveRequest,
+        saveCallback: SaveCallback,
+    ) {
+        // TODO: add save request behavior (BIT-1299)
+    }
+}