create GoogleAuth Button file

android/Omnivore/app/src/main/java/app/omnivore/omnivore/GoogleAuth.kt

@@ -0,0 +1,48 @@
+package app.omnivore.omnivore
+
+import android.app.Activity
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.ActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.compose.material3.Button
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import com.google.android.gms.auth.api.signin.GoogleSignIn
+import com.google.android.gms.auth.api.signin.GoogleSignInAccount
+import com.google.android.gms.auth.api.signin.GoogleSignInOptions
+import com.google.android.gms.tasks.Task
+
+
+@Composable
+fun GoogleAuthButton(viewModel: LoginViewModel) {
+  val context = LocalContext.current
+
+  val signInOptions = GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
+    .requestEmail()
+    .requestIdToken(stringResource(R.string.gcp_id))
+    .requestId()
+    .requestProfile()
+    .build()
+
+  val startForResult =
+    rememberLauncherForActivityResult(ActivityResultContracts.StartActivityForResult()) { result: ActivityResult ->
+      if (result.resultCode == Activity.RESULT_OK) {
+        val intent = result.data
+        if (result.data != null) {
+          val task: Task<GoogleSignInAccount> = GoogleSignIn.getSignedInAccountFromIntent(intent)
+          viewModel.handleGoogleAuthTask(task)
+        }
+      }
+    }
+
+  Button(
+    onClick = {
+      val googleSignIn = GoogleSignIn.getClient(context, signInOptions)
+      startForResult.launch(googleSignIn.signInIntent)
+    }
+  ) {
+    Text(text = "Continue With Google")
+  }
+}