Add README with installation & usage instructions.

Author: andrew-chang-dewitt

README.md

@@ -9,7 +9,7 @@ Install with `pip` from releases on this repo.
 For example, you can install version 0.1.0 with the following command:
 
 ```
-$ pip install https://github.com/cheese-drawer/lib-python-amqp-worker/releases/download/0.1.0/amqp_worker-0.1.0.tar.gz
+$ pip install https://github.com/cheese-drawer/lib-python-db-wrapper/releases/download/0.1.0/db-wrapper-0.1.0.tar.gz
 ```
 
 If looking for a different release version, just replace the two instances of `0.1.0` in the command with the version number you need.