自動生成 .gitignore

預設情況下，mix new <projectname> 將在專案根目錄中生成一個適用於 Elixir 的 .gitignore 檔案。

# The directory Mix will write compiled artifacts to.
/_build

# If you run "mix test --cover", coverage assets end up here.
/cover

# The directory Mix downloads your dependencies sources to.
/deps

# Where 3rd-party dependencies like ExDoc output generated docs.
/doc

# If the VM crashes, it generates a dump, let's ignore it too.
erl_crash.dump

# Also ignore archive artifacts (built via "mix archive.build").
*.ez