Create develop.md

docs/develop.md

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+# 代码提交说明
+
+FastDeploy使用clang-format, cpplint检查和格式化代码，提交代码前，需安装pre-commit
+```
+git clone https://github.com/PaddlePaddle/FastDeploy.git
+cd FastDeploy
+git checkout develop
+
+pip install pre-commit
+pip install yapf
+pip install cpplint
+pre-commit install
+```
+commit代码时，若提示无法找到clang-format，请自行安装clang-format