Stub documentation

Author: Kevin Paulisse

doc/dev/api/v1/catalog-diff.md

@@ -5,3 +5,17 @@
 `catalog-diff` allows you compare two catalogs and obtain the differences between them. Catalogs can be built if necessary.
 
 This is analogous to using the default arguments with the octocatalog-diff command-line script.
+
+```
+catalog_diff_result = OctocatalogDiff::API::V1.catalog_diff(
+
+)
+```
+
+## Options
+
+**NOTE**: Additional options as described in the [options reference](/doc/optionsref.md) may also have an effect on catalog difference generation.
+
+## Return value
+
+## Exceptions

doc/dev/api/v1/octocatalogdiff-catalog.md

@@ -0,0 +1,11 @@
+# octocatalog-diff v1 API documentation: OctocatalogDiff::Catalog
+
+## Overview
+
+`OctocatalogDiff::Catalog` is a class that represents a compiled catalog.
+
+This object is the return value from the [`catalog`](/doc/dev/api/v1/catalog.md) API call.
+
+## Methods
+
+## Exceptions