Updates Project Documentation

This commit updates project documentation to document the new persistent storage settings.

Author: Luidog

README.md

@@ -6,7 +6,7 @@ Node-RED FileMaker nodes. These nodes use [fms-api-client](https://github.com/Lu
 
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-The nodes in this project use [fms-api-client](https://github.com/Luidog/fms-api-client) to connect via the FileMaker Data API to FileMaker Server. The nodes that connect to FileMaker Server depend upon a configurable [client](https://github.com/Luidog/fms-api-client#client-creation) node. The client node uses [marpat](https://github.com/Luidog/marpat) to store and maintain FileMaker Data API session information in-memory. For security client configuration parameters are not exported with a flow.
+The nodes in this project use [fms-api-client](https://github.com/Luidog/fms-api-client) to connect via the FileMaker Data API to FileMaker Server. The nodes that connect to FileMaker Server depend upon a configurable [client](https://github.com/Luidog/fms-api-client#client-creation) node. The client node uses [marpat](https://github.com/Luidog/marpat) to store and maintain FileMaker Data API session information in-memory, on the filesystem, or in a [MongoDB](https://www.mongodb.com) cluster. Persistence is configured via Node-RED's [settings file](https://nodered.org/docs/user-guide/runtime/settings-file). For more information see the [storage](#storage) section. For security client configuration parameters are not exported with a flow.
 
 Once configured a client node will automatically create and maintain a FileMaker Data API session as needed. You are not required to call the [login](#login-node) or [logout](#logout-node) nodes in a flow.
 
@@ -105,14 +105,20 @@ These nodes can also be installed using the Node-RED palette manager.
 
 The nodes in this project all depend on a configurable Data API client. By default the client is saved in-memory. When saved in-memory a client will not persist between restarts of the Node-RED runtime. This means that each restart of the Node-RED runtime will cause the client to open new Data API sessions.
 
-To persist a client between Node-RED runtime restarts and allow active session monitoring and maintenance additional datastores can be configured. This project will accept a url property and an options property from a marpat object in the Node-RED settings.js file. Any datastore made available by [marpat](https://github.com/luidog/marpat). The url property accepts the following formats:
+To persist a client between Node-RED runtime restarts and allow active session monitoring and maintenance additional datastores can be configured. This project will accept a url property and an options property from a marpat object in the [Node-RED settings.js](https://nodered.org/docs/user-guide/runtime/settings-file) file. Any datastore made available by [marpat](https://github.com/luidog/marpat). The url property accepts the following formats:
 
 - MongoDB:
-  - Format: mongodb://[username:password@]host[:port][/db-name]
+  - Format: `mongodb://[username:password@]host[:port][/db-name]`
 - Filesystem:
-  - Format: nedb://[directory-path]
+  - Format: `nedb://[directory-path]`
 - In Memory:
-  - Format: nedb://memory
+  - Format: `nedb://memory`
+
+File based persistence example:
+
+```json
+{ "marpat": { "url": "nedb://dapi", "options": {} } }
+```
 
 ## Status Node
 
@@ -170,7 +176,6 @@ These nodes can be installed from the command line by running the following comm
 
 ### Databases Illustration
 
-
 ![Databases Node](https://github.com/Luidog/node-red-contrib-filemaker/blob/master/examples/images/databases-node.png?raw=true)
 
 These nodes can also be installed using the Node-RED palette manager.