Add issue template

.github/ISSUE_TEMPLATE/document-a-new-feature.md

@@ -0,0 +1,23 @@
+---
+name: Document a new feature
+about: Request documentation for new features in the Nillion SDK
+title: ''
+labels: documentation, enhancement
+assignees: ''
+
+---
+
+**Feature Description**
+A clear and concise description of the new feature that needs to be documented.
+
+**Why is this feature important?**
+Explain why this feature is relevant or valuable for users.
+
+**How do developers use the feature?**
+Describe how developers interact with or implement the feature. List any specific information, usage examples, parameters, or diagrams that should be documented.
+
+**Usage or commands**
+List relevant commands, code snippets, or usage scenarios that show how to use the feature.
+
+**Additional context**
+Link to all relevant PRs. Add any other context, links, screenshots, or resources about the feature here.