docs(svite): add migration guide and document cli options

Author: dominikg

packages/svite/README.md

@@ -1,5 +1,20 @@
 # svite
 
+This is the new svite for vite2. It is still a work in progress. Feedback is welcome
+
+Currently there is only one command for the cli to create new projects from templates.
+Unlike svite 0.8, it does not initialize git or install anything
+
+## get started
+
+```shell
+npx svite create my-svite-project
+cd my-svite-project
+npm install
+npm run dev
+npm run build
+```
+
 ## cli
 
 ```shell
@@ -8,4 +23,30 @@ svite create --help
 svite create my-svite-project
 ```
 
+### svite create
+
+```
+Usage:
+  $ svite create [targetDir]
+
+Options:
+  --t, --template <string>  template for new project. ["minimal","routify-mdsvex","windicss","preprocess-auto"] (default: minimal)
+  --ts, --typescript        enable typescript support for svelte (default: false)
+  -f, --force               force operation even if targetDir exists and is not empty (default: false)
+  -d, --debug               more verbose logging (default: false)
+  -h, --help                Display this message
+  -v, --version             Display version number
+```
+
+# Migration from 0.8
+
+- install vite@2 and @svitejs/vite-plugin-svelte
+- Update vite.config.js
+  - use the pattern described in the [readme](packages/vite-plugin-svelte/README.md) of the new vite-plugin-svelte
+  - remove old svite options
+  - read vite2 documentation on https://vitejs.dev
+  - add any svelte library you use to `optimizeDeps.exclude=[]` in vite.config
+- remove svite from dependencies
+- update package.json scripts to use `vite dev` and `vite build` instead of `svite dev` and `svite build`
+
 # TODO more docs