feat: add preloading template (#2655)

Co-authored-by: Himself65 <himself65@outlook.com>

packages/templates/Welcome-to-AFFiNE.md

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+# Welcome to AFFiNE
+
+# 👋 Quick Start
+
+> Your content should be as feature-rich as you like. We offer you an easy and simple approach to writing your content, with advanced tools that stay out of the way when you don't need them.
+
+## AFFiNE - not just a note taking app
+
+There are lots of apps out there, so why choose AFFiNE?
+
+AFFiNE is **easy** - _create_ a workspace, _collaborate_ with others and _share_ it online
+
+AFFiNE is **feature-rich** - offering a wide-range of _blocks_ that _empower_ your docs
+
+AFFiNE is **privacy focused** - with a local-first approach, keep control of your data
+
+AFFiNE is **open source** - you can check us out on [GitHub: toeverything/AFFiNE](https://github.com/toeverything/affine)
+
+## Let's get started!
+
+- Create a new page and begin editing - in `Paper` or `Edgeless`
+
+![](https://cdn.affine.pro/38928b822e78a8cf6cc1278c3cd7563967dfefcf744c2517a60c7bfe.gif)
+
+- Head over to `Workspace Settings` to find your `General` settings, enable multiplayer with `Collaboration`, share your docs with `Publish` and download your data with `Export`
+
+![](https://cdn.affine.pro/34043644b47f7bab79255a80e1b11d6cb173ec9d2eb0e3208c7badd2.png)
+
+## Looking for more support?
+
+Why not come and join the awesome [AFFiNE Community](https://community.affine.pro)? Whether you want to share new ideas or interact with other like minded individuals - we look forward to having you.