chore: delete unused code (#890)

* chore: delete unused code

* Update README.md

CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+As contributors and maintainers of this project,
+and in the interest of fostering an open and welcoming community,
+we pledge to respect all people who contribute through reporting issues,
+posting feature requests, updating documentation,
+submitting pull requests or patches, and other activities.
+
+We are committed to making participation in this project
+a harassment-free experience for everyone,
+regardless of level of experience, gender, gender identity and expression,
+sexual orientation, disability, personal appearance,
+body size, race, ethnicity, age, religion, or nationality.
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery
+* Personal attacks
+* Trolling or insulting/derogatory comments
+* Public or private harassment
+* Publishing other's private information,
+such as physical or electronic
+addresses, without explicit permission
+* Other unethical or unprofessional conduct.
+
+Project maintainers have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct.
+By adopting this Code of Conduct,
+project maintainers commit themselves to fairly and consistently
+applying these principles to every aspect of managing this project.
+Project maintainers who do not follow or enforce the Code of Conduct
+may be permanently removed from the project team.
+
+This code of conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community.
+
+Instances of abusive, harassing, or otherwise unacceptable behavior
+may be reported by opening an issue
+or contacting one or more of the project maintainers.
+
+This Code of Conduct is adapted from the [Contributor Covenant](http://contributor-covenant.org), version 1.2.0,
+available at [http://contributor-covenant.org/version/1/2/0/](http://contributor-covenant.org/version/1/2/0/)

CONTRIBUTING.md

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+# How to become a contributor and submit your own code
+
+**Table of contents**
+
+* [Contributor License Agreements](#contributor-license-agreements)
+* [Contributing a patch](#contributing-a-patch)
+* [Running the tests](#running-the-tests)
+* [Releasing the library](#releasing-the-library)
+
+## Contributor License Agreements
+
+We'd love to accept your sample apps and patches! Before we can take them, we
+have to jump a couple of legal hurdles.
+
+Please fill out either the individual or corporate Contributor License Agreement
+(CLA).
+
+  * If you are an individual writing original source code and you're sure you
+    own the intellectual property, then you'll need to sign an [individual CLA](https://developers.google.com/open-source/cla/individual).
+  * If you work for a company that wants to allow you to contribute your work,
+    then you'll need to sign a [corporate CLA](https://developers.google.com/open-source/cla/corporate).
+
+Follow either of the two links above to access the appropriate CLA and
+instructions for how to sign and return it. Once we receive it, we'll be able to
+accept your pull requests.
+
+## Contributing A Patch
+
+1.  Submit an issue describing your proposed change to the repo in question.
+1.  The repo owner will respond to your issue promptly.
+1.  If your proposed change is accepted, and you haven't already done so, sign a
+    Contributor License Agreement (see details above).
+1.  Fork the desired repo, develop and test your code changes.
+1.  Ensure that your code adheres to the existing style in the code to which
+    you are contributing.
+1.  Ensure that your code has an appropriate set of tests which all pass.
+1.  Submit a pull request.
+
+## Running the tests
+
+1.  [Prepare your environment for Node.js setup][setup].
+
+1.  Install dependencies:
+
+        npm install
+
+1.  Run the tests:
+
+        npm test
+
+1.  Lint (and maybe fix) any changes:
+
+        npm run fix
+
+[setup]: https://cloud.google.com/nodejs/docs/setup

LICENSE

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+
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+
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SECURITY.md

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+# Security Policy
+
+To report a security issue, please use [g.co/vulnz](https://g.co/vulnz).
+
+The Google Security Team will respond within 5 working days of your report on g.co/vulnz.
+
+We use g.co/vulnz for our intake, and do coordination and disclosure here using GitHub Security Advisory to privately discuss and fix the issue.