docs: Pre-development preparation (alibaba#762)

Author: baerwang

CONTRIBUTING_CN.md

@@ -73,6 +73,7 @@
 * [分支定义](#分支定义)
 * [提交规则](#提交规则)
 * [PR说明](#PR说明)
+* [开发前准备](#开发前准备)
 
 ### 工作区准备
 
@@ -168,6 +169,12 @@ git config --get user.email
 
 PR 是更改 Higress 项目文件的唯一方法。为了帮助审查人更好地理解你的目的，PR 描述不能太详细。我们鼓励贡献者遵循 [PR 模板](./.github/PULL_REQUEST_TEMPLATE.md) 来完成拉取请求。
 
+### 开发前准备
+
+```shell
+make prebuild && go mod tidy
+```
+
 ## 测试用例贡献
 
 任何测试用例都会受到欢迎。目前，Higress 功能测试用例是高优先级的。

CONTRIBUTING_EN.md

@@ -169,6 +169,12 @@ No matter commit message, or commit content, we do take more emphasis on code re
 
 PR is the only way to make change to Higress project files. To help reviewers better get your purpose, PR description could not be too detailed. We encourage contributors to follow the [PR template](./.github/PULL_REQUEST_TEMPLATE.md) to finish the pull request.
 
+### Pre-development preparation
+
+```shell
+make prebuild && go mod tidy
+```
+
 ## Test case contribution
 
 Any test case would be welcomed. Currently, Higress function test cases are high priority.