Merge branch 'promptless/document-custom-sections-readme' of https://github.com/fern-api/docs into promptless/document-custom-sections-readme

Author: devalog

fern/products/sdks/snippets/readme-options.mdx

@@ -10,6 +10,19 @@ readme:
     method: "POST"
     path: "/users"
     stream: false
+  customSections:
+    - title: "Custom Section"
+      language: "java"
+      content: |
+        This is a custom section. Latest package info is {{ group }}:{{ artifact }}:{{ version }}.
+    - title: "Custom Section"
+      language: "typescript"
+      content: |
+        Custom section for {{ packageName }}
+    - title: "Another Custom Section"
+      language: "typescript"
+      content: |
+        A second custom section for {{ packageName }}
   features:
     authentication:
       - method: "POST"
@@ -64,4 +77,27 @@ Specifies which endpoint's code snippet to showcase as the primary example in th
 
 <ParamField path="defaultEndpoint.stream" type="boolean" required={false} default="false" toc={true}>
   Whether the endpoint is a streaming endpoint. Defaults to `false`.
+</ParamField>
+
+### Custom sections
+
+Define a custom section in the generated README for a specific SDK. 
+
+<ParamField path="customSections.title" type="string" required={true}>
+  The title of the custom section as it will appear in the README.
+</ParamField>
+<ParamField path="customSections.language" type="'java' | 'typescript'" required={true}>
+  The target SDK language for this section. The custom section will only appear in README files generated for the specified language.
+</ParamField>
+<ParamField path="customSections.content" type="string" required={true}>
+  The Markdown content of the custom section. You can use template variables to dynamically insert package names and SDK version numbers.
+
+  | Language | Variable | Description |
+  |----------|----------|-------------|
+  | Java | `{{ group }}` | Maven groupId from `coordinate` field |
+  | Java | `{{ artifact }}` | Maven artifactId from `coordinate` field |
+  | Java | `{{ version }}` | SDK version |
+  | TypeScript | `{{ packageName }}` | Name of your package, as specified in the `package-name` field |
+  | TypeScript | `{{ version }}` | SDK version |
+
 </ParamField>