Add initial implementation of API, database, and user management components.

MikrocopApi/Services/Interfaces/IPasswordHashingService.cs

@@ -0,0 +1,7 @@
+namespace MikrocopApi.Services;
+
+public interface IPasswordHashingService
+{
+    (string Hash, string Salt) HashPassword(string password);
+    bool VerifyPassword(string password, string hashBase64, string saltBase64);
+}