update docs

Author: zjw1111

README.md

@@ -119,6 +119,16 @@ The reading is divided into two stages:
 
 ## Development
 
+### Clone the Repository
+
+If you don't have `git-lfs` installed, please install it first.
+
+```
+$ git clone https://github.com/alibaba/paimon-cpp.git
+$ cd paimon-cpp
+$ git lfs pull
+```
+
 ### CMake
 
 ```

docs/source/building.rst

@@ -57,6 +57,7 @@ repository:
 
    $ git clone https://github.com/alibaba/paimon-cpp.git
    $ cd paimon-cpp
+   $ git lfs pull
 
 Manual configuration
 --------------------