[FEATURE] #87 : 로그인된 회원인지 검증 유스케이스 구현

core/domain/src/main/java/com/wap/wapp/core/domain/usecase/auth/IsUserSignInUseCase.kt

@@ -0,0 +1,10 @@
+package com.wap.wapp.core.domain.usecase.auth
+
+import com.wap.wapp.core.data.repository.auth.AuthRepository
+import javax.inject.Inject
+
+class IsUserSignInUseCase @Inject constructor(
+    private val authRepository: AuthRepository,
+) {
+    suspend operator fun invoke(): Result<Boolean> = authRepository.isUserSignIn()
+}