System hooks API.

doc/api/system_hooks.md

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+All methods require admin authorization.
+
+## List system hooks
+
+Get list of system hooks
+
+```
+GET /hooks
+```
+
+Will return hooks with status `200 OK` on success, or `404 Not found` on fail.
+
+## Add new system hook hook
+
+```
+POST /hooks
+```
+
+Parameters:
+
++ `url` (required) - The hook URL
+
+Will return status `201 Created` on success, or `404 Not found` on fail.
+
+## Test system hook
+
+```
+GET /hooks/:id
+```
+
+Parameters:
+
++ `id` (required) - The ID of hook
+
+Will return hook with status `200 OK` on success, or `404 Not found` on fail.
+
+## Delete system hook
+
+```
+DELETE /hooks/:id
+```
+
+Parameters:
+
++ `id` (required) - The ID of hook
+
+Will return status `200 OK` on success, or `404 Not found` on fail.