Added documentation and a diagram for gobi job (#767)

Co-authored-by: Ryan Laddusaw <[email protected]>

docs/gobi/readme.md

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+# GOBI ISBN Holdings Job
+This workflow gets the records of all items added to Alma in the last 5 years and creates an ISBN export file for export to GOBI. This is to help prevent us from purchasing an item we already own.
+
+## Flow Diagram
+
+
+```mermaid
+sequenceDiagram
+accTitle: Diagram depicting the generation and export of an ISBN file of items added to Alma in the last 5 years.
+accDescr {
+    Lib Jobs downloads a CSV file of items added to Alma in the last 5 years from LibSFTP weekly.
+    Lib Jobs creates an ISBN file in the [format](https://connect.ebsco.com/s/article/GOBI-Library-Holdings-Load-Service?language=en_US) recommended by GOBI.
+    Lib Jobs uploads the ISBN file to the GOBI SFTP server.
+}
+LibSFTP->>Lib Jobs: Lib Jobs downloads a CSV file of items added to Alma in the last 5 years from LibSFTP weekly
+Lib Jobs->>Lib Jobs: Lib Jobs creates an ISBN file in the format recommended by GOBI
+Lib Jobs ->>GOBI SFTP: Lib Jobs uploads the ISBN file to the GOBI SFTP server.
+```