Defined the platforms, product, and targets to start work in the Package.swift file.

Tests/DiscogsService/discogs_serviceTests.swift

@@ -0,0 +1,6 @@
+import Testing
+@testable import discogs_service
+
+@Test func example() async throws {
+    // Write your test here and use APIs like `#expect(...)` to check expected conditions.
+}