feat: add preloading template (#2655)

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

packages/templates/AFFiNE-Docs.md

@@ -0,0 +1,25 @@
+# AFFiNE Docs
+
+This repo is the source for AFFiNE documentation.
+
+The published documentation is at:
+
+- https://docs.affine.pro
+
+Please [file an issue](https://github.com/toeverything/AFFiNE-docs/issues) if you can't find what you are looking for.
+
+## Get Started
+
+This repo is split into folders - with each folder being a separate category of documentation.
+
+You can browse the folders to view the pages within each category.
+
+Please note: Some pages may not display correctly on GitHub, be sure to check the corresponding page on GitBook.
+
+### Asset Naming
+
+All assets should be stored in `.gitbook/assets/`.
+
+The asset should be named according to where it will be used.
+
+If an image is needed for `/developer-docs/coding/setup.md` the expected filename would be `developer-docs_coding_setup` where `_` separates each folder/file. And if multiple images are required a unique filename can be appeneded, such as `_01`.