Update issue templates

.github/ISSUE_TEMPLATE/extension-request.md

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+---
+name: Extension Request
+about: Request new extension for PyserSSH
+title: Extension Request
+labels: new extension
+assignees: damp11113
+
+---
+
+**Extension Name**
+[Enter Extension Name]
+
+**Purpose**
+[Briefly describe the purpose or functionality of the extension.]
+
+**Expected Features (optional)**
+[List the features or capabilities that this extension will provide.]
+
+**Use Case**
+[Provide a scenario or use case where this extension would be beneficial.]
+
+**Code/Repository Link**
+[Provide a link to the code repository or any relevant code snippets.]
+
+**Rationale**
+[Why you request this extension]
+
+**Implementation Suggestions**
+[If you have any suggestions or ideas on how this extension could be implemented, please share them here.]
+
+**Have more Information? (optional)**
+[Include any additional details, documentation, or resources that may be relevant to this extension request.]
+
+**Note:** This request will undergo review by the maintainers of PyserSSH. Your input and feedback are appreciated.