adjust config files and readme

load_pam_plugin.cnf

@@ -1,4 +1,13 @@
 [mariadb]
-plugin_load=auth_pam.so
+plugin_load=auth_pam
+pam_use_cleartext_plugin = ON
+
+# create these stuff and enable the following configuration
+# otherwise the pam_use_cleartext_plugin won't work which
+# is required for dotnet connections
+# ssl_cert = /etc/mysql/conf.d/ssl/server-cert.pem
+# ssl_key = /etc/mysql/conf.d/ssl/server-key.pem
+# ssl_ca = /etc/mysql/conf.d/ssl/ca.pem
+