Container Analysis samples [(#2258)](GoogleCloudPlatform/python-docs-…

…samples#2258)

added container analysis samples and tests

samples/snippets/.gitignore

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+venv*

samples/snippets/README.md

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+<img src="https://avatars2.githubusercontent.com/u/2810941?v=3&s=96" alt="Google
+Cloud Platform logo" title="Google Cloud Platform" align="right" height="96"
+width="96"/>
+
+# Google Cloud Container Analysis Samples
+
+
+Container Analysis scans container images stored in Container Registry for vulnerabilities.
+Continuous automated analysis of containers keep you informed about known vulnerabilities so 
+that you can review and address issues before deployment.
+
+Additionally, third-party metadata providers can use Container Analysis to store and 
+retrieve additional metadata for their customers' images, such as packages installed in an image.
+
+
+## Description
+
+These samples show how to use the [Google Cloud Container Analysis Client Library](https://cloud.google.com/container-registry/docs/reference/libraries).
+
+## Build and Run
+1.  **Enable APIs** 
+    - [Enable the Container Analysis API](https://console.cloud.google.com/flows/enableapi?apiid=containeranalysis.googleapis.com)
+    and create a new project or select an existing project.
+1.  **Install and Initialize Cloud SDK**
+    - Follow instructions from the available [quickstarts](https://cloud.google.com/sdk/docs/quickstarts)
+1. **Authenticate with GCP**
+    - Typically, you should authenticate using a [service account key](https://cloud.google.com/docs/authentication/getting-started)
+1.  **Clone the repo** and cd into this directory
+
+    ```
+    git clone https://github.com/GoogleCloudPlatform/python-docs-samples
+    cd python-docs-samples
+    ```
+
+1. **Set Environment Variables**
+
+    ```
+    export GCLOUD_PROJECT="YOUR_PROJECT_ID"
+    ```
+
+1. **Run Tests**
+
+    ```
+    nox -s "py36(sample='./container_registry/container_analysis')"
+    ```
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../LICENSE)
+

samples/snippets/requirements.txt

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+google-cloud-pubsub == 0.42.1
+google-cloud-containeranalysis == 0.1.0
+grafeas == 0.1.0
+pytest
+flaky
+mock