Add password history documentation and images

docs/en/modules/identity/password-history.md

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+# Password History
+
+## Introduction
+
+> You must have an ABP Team or a higher license to use this module & its features.
+
+The Identity PRO module has a built-in password history function.
+
+## Password history settings
+
+You need to enable the password history and configure related settings:
+
+![identity-pro-module-password-history-settings](../../images/identity-pro-module-password-history-settings.png)
+
+* **Enable prevent password reuse**: Whether to prevent users from reusing their previous passwords.
+* **Password change period**: The number of previous passwords that cannot be reused.
+
+When you enable the password history, users and administrators will not be able to reuse their previous passwords when changing/resetting their passwords.
+
+![identity-pro-module-change-password](../../images/identity-pro-module-change-password.png)