Add table persistence, organize files

Sources/App/Extensions/Crypto+Extensions.swift

@@ -0,0 +1,14 @@
+import Foundation
+import Crypto
+
+extension String {
+
+    /**
+     Create a new access token.
+     */
+    static func newToken() -> String {
+        Crypto.SymmetricKey.init(size: .bits128).withUnsafeBytes {
+            $0.hexEncodedString()
+        }
+    }
+}