Add best practices to docs (#486)

Author: sureshanaparti

source/adminguide/best_practices.rst

@@ -0,0 +1,28 @@
+.. Licensed to the Apache Software Foundation (ASF) under one
+   or more contributor license agreements.  See the NOTICE file
+   distributed with this work for additional information#
+   regarding copyright ownership.  The ASF licenses this file
+   to you under the Apache License, Version 2.0 (the
+   "License"); you may not use this file except in compliance
+   with the License.  You may obtain a copy of the License at
+   http://www.apache.org/licenses/LICENSE-2.0
+   Unless required by applicable law or agreed to in writing,
+   software distributed under the License is distributed on an
+   "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+   KIND, either express or implied.  See the License for the
+   specific language governing permissions and limitations
+   under the License.
+   
+
+Best Practices
+==============
+
+This section provides the best practices to follow for your cloud.
+
+The following are some of the best practices:
+
+-  Configure 'api.allowed.source.cidr.list' at cloud level or an account
+   level to limit source IPs where the API requests are allowed from.
+   
+-  Setup fail2ban or similar tools to avoid any brute-force attempts
+   for any operations.

source/adminguide/index.rst

@@ -187,3 +187,12 @@ Events and Troubleshooting
 
    events
    troubleshooting
+
+
+Best Practices
+--------------
+
+.. toctree::
+   :maxdepth: 4
+
+   best_practices