Externalize Secure Agent configurations so that those can be persisted and re-use

• Add instructions on how to mount various configurations for Secure Agent so those can be re-used.
• Updated README.md with descriptions on how to mount volumes.
• Documented various ports in Secure Agents.
• Fixed punctuations.

@ERIC.SCHOVILLE @JARED.KOSANOVIC

README.md

@@ -28,7 +28,7 @@ The container executes a bash script called run_agent.sh upon start.  It needs I
 * JSON_LOG (optional) - If this is set, then the log output will be in JSON format.
 
 ### Externalized Configurations
-Secure Agent's configurations can be externalized using Docker [volumes](https://docs.docker.com/storage/volumes/). Following 
+Secure Agent's configurations can be externalized using Docker [volumes](https://docs.docker.com/storage/volumes/). 
 Secure Agent's directories and files can be externalized for containers. Note that after initial 
 container startup, these configurations can be used to start subsequent containers.