feat: add vscode extension

extension/README.md

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+# Dioxus VSCode Extension
+
+![Dioxus Logo](https://dioxuslabs.com/guide/images/dioxuslogo_full.png)
+
+This extension wraps functionality in Dioxus CLI to be used in your editor! Make sure the dioxus-cli is installed before using this extension.
+
+## Current commands:
+
+### Convert HTML to RSX
+Converts a selection of html to valid rsx.
+
+### Convert HTML to Dioxus Component
+
+Converts a selection of html to a valid Dioxus component with all SVGs factored out into their own module.
+
+## packaging
+
+```
+$ cd myExtension
+$ vsce package
+# myExtension.vsix generated
+$ vsce publish
+# <publisherID>.myExtension published to VS Code Marketplace
+```