Changed module name from my_auth to myauth

Changed encryption algorithm to argon2
Added unit tests

tests/core/test_password.py

@@ -0,0 +1,25 @@
+import pytest
+
+from myauth.core import PasswordManager
+
+
+@pytest.fixture()
+def password_manager():
+  return PasswordManager()
+
+
+def test_i_can_hash_password(password_manager):
+  hashed_password = password_manager.hash_password("password")
+  assert hashed_password is not None
+  assert hashed_password != "password"
+
+
+def test_i_can_verify_password(password_manager):
+  password = "password"
+  hashed_password = password_manager.hash_password(password)
+  assert password_manager.verify_password(password, hashed_password)
+
+def test_i_cannot_verify_invalid_password(password_manager):
+  password = "password"
+  hashed_password = password_manager.hash_password(password)
+  assert not password_manager.verify_password("invalid_password", hashed_password)