add a security policy

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<details><summary>Log from Synthtool</summary>

```
2021-04-27 18:28:52,778 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-os-config/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-27 18:28:54,028 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
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…g to v1.2.2 (#264)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-os-config](https://togithub.com/googleapis/java-os-config) | `1.2.1` -> `1.2.2` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-os-config/1.2.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-os-config/1.2.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-os-config/1.2.2/compatibility-slim/1.2.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-os-config/1.2.2/confidence-slim/1.2.1)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/java-os-config</summary>

### [`v1.2.2`](https://togithub.com/googleapis/java-os-config/blob/master/CHANGELOG.md#&#8203;122-httpswwwgithubcomgoogleapisjava-os-configcomparev121v122-2021-04-23)

[Compare Source](https://togithub.com/googleapis/java-os-config/compare/v1.2.1...v1.2.2)

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Adds a standard enumeration of library types in .repo-metadata.json

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…cies to v1.1.0 (#271)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-shared-dependencies](https://togithub.com/googleapis/java-shared-dependencies) | `1.0.0` -> `1.1.0` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/1.1.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/1.1.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/1.1.0/compatibility-slim/1.0.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-shared-dependencies/1.1.0/confidence-slim/1.0.0)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>googleapis/java-shared-dependencies</summary>

### [`v1.1.0`](https://togithub.com/googleapis/java-shared-dependencies/blob/master/CHANGELOG.md#&#8203;110-httpswwwgithubcomgoogleapisjava-shared-dependenciescompare100v110-2021-05-10)

[Compare Source](https://togithub.com/googleapis/java-shared-dependencies/compare/v1.0.0...v1.1.0)

##### Dependencies

-   update dependency com.google.protobuf:protobuf-bom to v3.16.0 ([#&#8203;348](https://www.github.com/googleapis/java-shared-dependencies/issues/348)) ([0aacfde](https://www.github.com/googleapis/java-shared-dependencies/commit/0aacfdeec70e30803734db8287c47e4fad5481ef))
-   update gax.version to v1.64.0 ([#&#8203;345](https://www.github.com/googleapis/java-shared-dependencies/issues/345)) ([478bd35](https://www.github.com/googleapis/java-shared-dependencies/commit/478bd35296293e81c7e70157f50bfbebdc1bb54d))
-   update iam.version to v1.0.13 ([#&#8203;343](https://www.github.com/googleapis/java-shared-dependencies/issues/343)) ([3637923](https://www.github.com/googleapis/java-shared-dependencies/commit/363792392b71deff5cc5731104b631122fba5e61))

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…-info-reports-plugin to v3.1.2 (#267)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| org.apache.maven.plugins:maven-project-info-reports-plugin | `3.1.1` -> `3.1.2` | [![age](https://badges.renovateapi.com/packages/maven/org.apache.maven.plugins:maven-project-info-reports-plugin/3.1.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/org.apache.maven.plugins:maven-project-info-reports-plugin/3.1.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/org.apache.maven.plugins:maven-project-info-reports-plugin/3.1.2/compatibility-slim/3.1.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/org.apache.maven.plugins:maven-project-info-reports-plugin/3.1.2/confidence-slim/3.1.1)](https://docs.renovatebot.com/merge-confidence/) |

---

### Configuration

📅 **Schedule**: At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻️ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

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🤖 I have created a release \*beep\* \*boop\*
---
### Updating meta-information for bleeding-edge SNAPSHOT release.
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

🤖 I have created a release \*beep\* \*boop\*
---
### [1.2.3](https://www.github.com/googleapis/java-os-config/compare/v1.2.2...v1.2.3) (2021-05-14)


### Dependencies

* update dependency com.google.cloud:google-cloud-shared-dependencies to v1.1.0 ([#271](https://www.github.com/googleapis/java-os-config/issues/271)) ([bb71f83](https://www.github.com/googleapis/java-os-config/commit/bb71f83e25fc9a5fe68ab3123f9c29bcc177a6da))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).