JaeSang Yoo

FYI, Build dependency packages in Ubuntu were following: * libhangul-dev * libibus-1.0-dev In a single command line: > $ sudo apt install libhangul-dev libibus-1.0-dev

Some issues are resolved by @onting in commit 6138d7807bae50c8c2f04d617effdf6f9f329e02 But still, I think there are more tasks to improve README.md I'll yield these issues as **good first issue**

I'll survey other open source project's contribution guides to apply to our repositories. Yet we're using here as the main repository, It'll be handled here. When the entry repository comes,...

Github is providing [great examples for contribution guides](https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/setting-guidelines-for-repository-contributors#examples-of-contribution-guidelines).

If you don't mind, could you test "4. Keys on numpad" with Numlock toggles? I doubt it will act differently by the Numlock status.