ENG-1164 Add readme to jira_assignee_from_calendar (#21)

Co-authored-by: Daniel Abraham <[email protected]>

jira_assignee_from_calendar/README.md

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+# JIRA Assignee From Google Calendar Workflow 
+
+This real-life example workflow demonstrates the integration of JIRA and Google Calendar in an on-call scenario.
+
+## Benefits
+
+- **Focus on what matters**: Write code that focuses on the desired outcome, not the underlying infrastructure.
+- **Flexibility**: Implement your own authorization flow or use the one that works out of the box.
+- **Extensibility**: Easily add additional steps or integrations.
+
+## How It Works
+
+- **Trigger**: A new Jira issue in the designated Jira project (specified in [`autokitteh.yaml`](./autokitteh.yaml))
+- **Result**: The current person on-call is retrieved via the Google Calendar API and added as the assignee in the Jira issue that triggered the workflow.