docs: add section for add file

src/docs/version_002/resources/files/add_file/copy.md

@@ -1 +1,59 @@
 # Add File {% #add-file %}
+
+This endpoint allows you to add a file to a record. The request body must be a multipart form data request.
+
+## Request Body Properties
+
+{% table %}
+
+- Property Name
+- Data Type
+- Description
+
+---
+
+- recordId
+- `number`
+- The id of the record to which the file will be added.
+
+---
+
+- fieldId
+- `number`
+- The id of the field to which the file will be added.
+
+---
+
+- notes
+- `string`
+- The notes to be added to the file.
+
+---
+
+- modifiedDate
+- `string`
+- The date the file was last modified.
+
+---
+
+- file
+- `binary`
+- The file to be added.
+
+{% /table %}
+
+## Response Body Properties
+
+{% table %}
+
+- Property Name
+- Data Type
+- Description
+
+---
+
+- id
+- `number`
+- The id of the file that was added.
+
+{% /table %}