Add kb

docs/en/kb/can-not-login-with-admin-user.md

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+# Problem: Can not login with the admin user
+
+* Try username `admin` and Password `1q2w3E*`.
+* Try to migrate database. If you have a `DbMigrator` application in your solution, use it. It will seed initial data and create the admin user for you.
+* If not works, read the README.MD file in your solution, or check the [Getting Started](https://abp.io/docs/latest/get-started) document.

docs/en/kb/index.md

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 The following documents provide useful information about several topics you might need to know.
 
 * [How to Fix "Filename too long" Error on Windows](windows-path-too-long-fix.md)
+* [Problem: Can not login with the admin user](can-not-login-with-admin-user.md)
 * [When to Use a Distributed Cache Server](when-to-use-a-distributed-cache-server.md)