docs: add apps section

src/docs/version_001/resources/apps/copy.md

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+# Apps {% #apps %}
+
+These are objects that represent apps and/or surveys in an Onspring instance. You can retrieve a list of apps that the given [API Key](#authentication) has access to.
+
+## App Properties
+
+{% table %}
+
+- Property Name
+- Data Type
+- Description
+
+---
+
+- Id
+- `number`
+- The id of the app.
+
+---
+
+- Name
+- `string`
+- The name of the app.
+
+{% /table %}

src/docs/version_001/resources/apps/example.md

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+# The App Object
+
+{% code heading="APP" defaultLanguage="json" %}
+
+```json
+{
+  "Id": 195,
+  "Name": "Tasks"
+}
+```
+
+{% /code %}