Removed boilerplate source files from the library and test targets.

Sources/DiscogsService/discogs_service.swift

@@ -1,2 +0,0 @@
-// The Swift Programming Language
-// https://docs.swift.org/swift-book

Tests/DiscogsService/discogs_serviceTests.swift

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