docs: upload snapshot

README.md

@@ -2,31 +2,43 @@
 
 One click to init an excalidraw with collaboration.
 
-Docs:
+Snapshot:
+
+![snapshot](./_assets/snapshot.png)
+
+Demo:
+
+WIP
+
+Related docs:
 
 - [Self hosted online collaborative drawing platform Excalidraw | Log4D](https://en.blog.alswl.com/2022/10/self-hosted-excalidraw/)
 - [私有化在线协同画图平台 Excalidraw | Log4D]( https://blog.alswl.com/2022/10/self-hosted-excalidraw/ )
 
-Build and Run:
+
+## Build and Run
+
+Clone, patch, and build:
 
 ```
+git clone --recursive git@github.com:alswl/excalidraw-collaboration.git
+cd excalidraw-collaboration
 git config submodule.excalidraw.ignore all # ignore submodule changes, we will patch them
 
-make patch
-make images
+make patch images
 git commit -a -m 'feat: new image'
 make bump-version
 docker-compose up
 ```
 
-Browse:
+Browse it:
 
 - open http://127.0.0.1/ ,and you will see the excalidraw page
 - Click the `Live Collaboration` button, and you will see the collaboration page
 - Now you can share the collaboration page with your friends, and you can draw together.
 
 
-Public Release:
+About public network release:
 
 if you want to release your own excalidraw in public network,
 you should modify the `excalidraw.production.env` file,