docs: add deprecation notice in readme (#375)

Author: Enter-tainer

contrib/typst-preview/editors/vscode/README.md

@@ -1,3 +1,20 @@
+# [DEPRECATION NOTICE] Typst preivew extension has been integrated into [tinymist](https://github.com/Myriad-Dreamin/tinymist)
+
+We recommend all users migrate to tinymist for the following benefits:
+
+- More centralized resource management
+- Reduced redundancy and lower resource usage
+- Easier updates and maintenance
+
+This repository will no longer be updated in future. All development will move to tinymist. Thank you for your support and understanding!
+
+- We still maintain the typst-preview extension for a while in a best effort way.
+   - The lazy people can continue using their setting, as all old things are still working.
+   - This respect people who love minimal env, like a treesitter plugin plus preview.
+- Tinymist will ensure compatibility to typst-preview as much as possible.
+   - for vscode users: uninstall the preview extension and install the tinymist extension.
+   - for standalone cli users: `typst-preview -> tinymist preview`
+
 # [Typst Preview VSCode](https://github.com/Enter-tainer/typst-preview)
 
 Preview your Typst files in vscode instantly!