Adding test plan

SecretiveTests/SecretiveTests.swift

@@ -24,11 +24,5 @@ class SecretiveTests: XCTestCase {
         // Use XCTAssert and related functions to verify your tests produce the correct results.
     }
 
-    func testPerformanceExample() {
-        // This is an example of a performance test case.
-        self.measure {
-            // Put the code you want to measure the time of here.
-        }
-    }
 
 }