Added additional comments to readme.md

samples/manage/windows-containers/mssql-server-2014-express-windows/readme.md

@@ -17,7 +17,7 @@ Note: This dockerfile is based on Buc Rogers' work that can be found [here] (htt
 ## About this sample
 
 1. **Applies to:** SQL Server 2014 Express, Windows Server Technical Preview 4 or later
-5. **Authors:** Perry Skountrianos [perrysk-msft]
+5. **Authors:** Perry Skountrianos [perrysk-msft], Max Knor [knom]
 
 <a name=before-you-begin></a>
 
@@ -27,16 +27,44 @@ To run this sample, you need the following prerequisites.
 
 **Software prerequisites:**
 
-You can run the container with the following command. Note the you'll need Windows Server Core TP5 v10.0.14300.1000.
-docker run -p 1433:1433 --env sa_password=<YOUR SA PASSWORD> microsoft/mssql-server-2014-express-windows
+You can run the container with the following command. 
+(Note the you'll need Windows Server Core TP5 v10.0.14300.1000.)
+
+```` 
+docker run -p 1433:1433 -v C:/temp/:C:/temp/ --env sa_password=<YOUR SA PASSWORD> --env attach_dbs="<DB-JSON-CONFIG>" -v microsoft/mssql-server-2014-express-windows
+```` 
+
+- **-p HostPort:containerPort** is for port-mapping a container network port to a host port.
+- **-v HostPath:containerPath** is for mounting a folder from the host inside the container. 
+
+  This can be used for saving database outside of the container.
 
 <a name=run-this-sample></a>
 
 ## Run this sample
 
-The image provides one environment variable to set the sa password: </br>
+The image provides two environment variables to optionally set: </br>
 - sa_password: Sets the sa password and enables the sa login
+- attach_dbs: The configuration for attaching custom DBs (.mdf, .ldf files).
 
+  This should be a JSON string, formed like the following (note the SINGLE quotes and everything in one line):
+  ``` 
+[{'dbName':'MaxDb','dbFiles':['C:\\temp\\maxtest.mdf','C:\\temp\\maxtest_log.
+ldf']},{'dbName':'PerryDb','dbFiles':['C:\\temp\\perrytest.mdf','C:\\temp\\perrytest_log.
+ldf']}]
+  ``` 
+  There can be zero to many databases in the array.
+  - dbName: The name of the database
+  - dbFiles: An array of absolute paths to the .MDF and .LDF files.
+
+    Can be one or many, note that the path has double backslashes for escaping!
+
+This example shows all parameters in action:	
+```
+docker run -p 1433:1433 -v C:/temp/:C:/temp/ --env attach_dbs="[{'dbName':'MaxTest','dbFiles':['C:\\temp\\maxtest.mdf','C:\\temp\\maxtest_log.
+ldf']}]" sqlexpr
+```
+	
 <a name=sample-details></a>
 
 ## Sample details