Opt gitignore

[jackxu2011]

What is the purpose of the change

opt the gitignore file

Brief change log

(for example:)

• add ide related folder to gitignore
• add generated folder to gitignore
• remove every module's target file

Verifying this change

(Please pick either of the following options)
This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• Anything that affects deployment: no
• The Core framework, i.e., AppConn, Orchestrator, ApiService.:no

Documentation

• Does this pull request introduce a new feature? no
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)