Added READMEs, LICENSE, etc. (#4)

Signed-off-by: michaelawyu <chenyu1@microsoft.com>
Co-authored-by: Simon Waight <simon.waight@gmail.com>

Author: michaelawyu

CODE_OF_CONDUCT.md

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+This repository is part of the KubeFleet project, a CNCF sandbox project. See the
+[KubeFleet Contributor Code of Conduct](https://github.com/kubefleet-dev/kubefleet/blob/main/CODE_OF_CONDUCT.md)
+for more information.

CONTRIBUTING.md

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+# Contributing
+
+KubeFleet cookbook repository welcomes contributions and feedback! Help us make KubeFleet cookbook better by adding new learning
+materials, fixing bugs/issues in existing materials, or proposing ideas for new tutorials/labs.
+
+## Terms
+
+All contributions to the repository must be submitted under the terms of the [CC BY 4.0 International](https://creativecommons.org/licenses/by/4.0/deed.en) license.
+
+## Certificate of Origin
+
+By contributing to this project, you agree to the Developer Certificate of Origin (DCO). This document was created by the Linux Kernel community and is a simple statement that you, as a contributor, have the legal right to make the contribution. See the [DCO](DCO) file for details.
+
+### DCO Sign Off
+
+You must sign off your commit to state that you certify the [DCO](DCO). To certify your commit for DCO, add a line like the following at the end of your commit message:
+
+```
+Signed-off-by: John Smith <john@example.com>
+```
+
+This can be done with the `--signoff` option to `git commit`. See the [Git documentation](https://git-scm.com/docs/git-commit#Documentation/git-commit.txt--s) for details.
+
+## Code of Conduct
+
+The KubeFleet project has adopted the CNCF Code of Conduct. Refer to our [Community Code of Conduct](CODE_OF_CONDUCT.md) for details.
+
+## Adding new materials
+
+To add a new tutorial/lab to the cookbook repository, create a new directory, add scripts/instructions as necessary,
+and submit a PR. Maintainers of the cookbook repo will review the contents and process the PR accordingly. Do not forget
+to update the list of current materials in the README file in the PR.

DCO

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+Developer Certificate of Origin
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.

GOVERNANCE.md

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+This repository is part of the KubeFleet project, a CNCF sandbox project. See the
+[KubeFleet Governance Model](https://github.com/kubefleet-dev/kubefleet/blob/main/GOVERNANCE.md) for more information.