Add empty test suite

Author: IanKeen

Tests/CamilleTests/CamilleTests.swift

@@ -0,0 +1,13 @@
+import XCTest
+@testable import Camille
+
+class CamilleTests: XCTestCase {
+    func testExample() {
+        //
+    }
+
+
+    static var allTests = [
+        ("testExample", testExample),
+    ]
+}

Tests/LinuxMain.swift

@@ -0,0 +1,6 @@
+import XCTest
+@testable import CamilleTests
+
+XCTMain([
+    testCase(CamilleTests.allTests),
+])