Update README.md

LICENSE

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+Copyright 2013 Benny Chew
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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 dynamodump
 ==========
 
-Backup and restore for Amazon DynamoDB
+Simple backup and restore script for Amazon DynamoDB using boto. Suitable for DynamoDB usages of smaller data volume which do not warrant the usage of AWS Data Pipeline for backup/restores.
+
+Example
+-------
+```
+usage: dynamodump.py [-h] [-m MODE] [-r REGION] [-t TABLE]
+
+Simple DynamoDB backup/restore
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -m MODE, --mode MODE  'backup' or 'restore'
+  -r REGION, --region REGION
+                        AWS region to use, e.g. 'us-west-1'
+  -t TABLE, --table TABLE
+                        DynamoDB table name to backup or restore to
+```
+
+The script assumes your AWS access key and secret key is present in ~/.boto
+
+
+To Do
+-----
+- Support backup/restore to local DynamoDB installs
+- Support handling of multiple tables
+- Improve backup/restore performance