[doc] Add format checker section into project_guide.md (#2040)

Add how to enable format checker for incubating project.

Signed-off-by: Hyun Sik Yoon <hyunsik.yoon@samsung.com>

diff --git a/doc/project_guide.md b/doc/project_guide.md
index 069f3b7..af8da70 100644 (file)
--- a/doc/project_guide.md
+++ b/doc/project_guide.md
@@ -20,5 +20,8 @@ There is no formal proposal process. Anyone can submit an issue or a PR as a sta
 #### Requirement
 - A project should follow the formal review process that _nncc_ is currently using [[(How to create a Pull Request (in contribution guide)](https://github.sec.samsung.net/STAR/nncc/blob/master/doc/contribution_guide.md#how-to-create-a-pull-request)].
 
+#### How to enable format checker
+- Create a `.FORMATCHECKED` file in your project directory for format checker to check the source code of the directory and its subdirectories.
+
 #### How to contribute
 Anyone who wants to contribute can create and submit PRs and issues following [nncc contribution_guide](https://github.sec.samsung.net/STAR/nncc/blob/master/doc/contribution_guide.md). _nncc_ always welcomes your contribution.