Add docs for theia (#40)

Signed-off-by: Yun-Tang Hsu <hsuy@vmware.com>

CODE_OF_CONDUCT.md

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+# Community Code of Conduct
+
+Project Theia follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).

CONTRIBUTING.md

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 # Developer Guide
+
+Thank you for taking the time out to contribute to project Theia! Project Theia follows the [Antrea Developer Guide].
+Also check out [Theia documents](docs) for more information about Theia.
+
+## Notice
+
+The following sections have different content from [Antrea Developer Guide]. Please read them carefully when referring
+to [Antrea Developer Guide].
+
+### GitHub Workflow
+
+When following [Github Workflow in Antrea](https://github.com/antrea-io/antrea/blob/main/CONTRIBUTING.md#github-workflow),
+please make sure to change the name of repository from `antrea` to `theia`.
+
+### Getting your PR verified by CI
+
+In Theia, we have only one trigger phrase for individual checks:
+
+* `/theia-test-e2e`: Theia e2e tests
+
+For more information about the tests we run as part of CI, please refer to [ci/README.md](ci/README.md).
+
+[Antrea Developer Guide]: https://github.com/antrea-io/antrea/blob/main/CONTRIBUTING.md

GOVERNANCE.md

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 # Theia Governance
+
+Project Theia follows the [Antrea governance](https://github.com/antrea-io/antrea/blob/main/GOVERNANCE.md).
+
+## Contributors
+
+Anyone can contribute to the project (e.g. open a PR) as long as they follow the guidelines in [CONTRIBUTING.md](CONTRIBUTING.md).
+
+## Maintainers
+
+The list of current Theia maintainers can be found in [MAINTAINERS.md](MAINTAINERS.md).

MAINTAINERS.md

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 # Theia Maintainers
+
+This is the current list of maintainers for the Theia project. The maintainer
+role is described in [GOVERNANCE.md](GOVERNANCE.md).
+
+| Maintainer        | GitHub ID    | Affiliation |
+|-------------------|--------------|-------------|
+| Antonin Bas       | antoninbas   | VMware      |
+| Jianjun Shen      | jianjuns     | VMware      |
+| Quan Tian         | tnqn         | VMware      |
+| Salvatore Orlando | salv-orlando | VMware      |
+| Ziyou Wang        | ziyouw       | VMware      |

SECURITY.md

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 # Security Procedures
+
+Project Theia follows the [Antrea security procedures](https://github.com/antrea-io/antrea/blob/main/SECURITY.md).

ci/README.md

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+# Theia CI
+
+Project Theia follows [Antrea CI](https://github.com/antrea-io/antrea/blob/main/ci/README.md).
+
+## Notice
+
+1. At the moment, we don't support integration tests in Theia.
+2. For information about our Jenkins CI jobs, please see [here](jenkins/README.md).