docs: add error handling section to version 1

src/docs/version_001/error_handling/example.md

@@ -0,0 +1,26 @@
+# Error Code Summary
+
+{% code heading="ERROR CODES" defaultLanguage="text" %}
+
+```text
+400 Bad Request - The request was unacceptable, often due to missing a required parameter.
+401 Unauthorized - No valid API key provided.
+403 Forbidden - The API key doesn't have permissions to perform the request.
+404 Not Found - The requested resource doesn't exist.
+499 Client Closed Request - Our API gateway closed the connection because the request exceeded the 90 second timeout limit.
+5xx Server Errors - Something went wrong on Onspring's end.
+```
+
+{% /code %}
+
+# The Error Object
+
+{% code heading="ERROR OBJECT" defaultLanguage="json" %}
+
+```json
+{
+  "Message": "Client does not have access to read app: 1"
+}
+```
+
+{% /code %}