Add harp-utils to docs

docs/articles/harp-utils.md

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+Harp Utilities
+==========
+
+# Get device metadata from device
+
+In order to get device metadata from device, use the `GetHarpDeviceMetadata` operator. This operator will connect to an harp device and serialize a `HarpDeviceMetadata` object that can then be saved to a text file. For instance:
+

docs/articles/toc.yml

@@ -5,4 +5,6 @@
   - name: Version Control
     href: version-control.md
   - name: Core Logging
-    href: core-logging.md
+    href: core-logging.md
+  - name: Harp Utilities
+    href: harp-utils.md

docs/workflows/GenerateHarpDeviceMetadatataExample.bonsai

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+<?xml version="1.0" encoding="utf-8"?>
+<WorkflowBuilder Version="2.8.1"
+                 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+                 xmlns:io="clr-namespace:Bonsai.IO;assembly=Bonsai.System"
+                 xmlns="https://bonsai-rx.org/2018/workflow">
+  <Workflow>
+    <Nodes>
+      <Expression xsi:type="IncludeWorkflow" Path="AllenNeuralDynamics.HarpUtils:GetHarpDeviceMetadata.bonsai">
+        <PortName>COM3</PortName>
+      </Expression>
+      <Expression xsi:type="Combinator">
+        <Combinator xsi:type="io:WriteAllText">
+          <io:Path>metadata.json</io:Path>
+          <io:Overwrite>false</io:Overwrite>
+          <io:Append>false</io:Append>
+        </Combinator>
+      </Expression>
+    </Nodes>
+    <Edges>
+      <Edge From="0" To="1" Label="Source1" />
+    </Edges>
+  </Workflow>
+</WorkflowBuilder>