Revert "Removing plantuml due to #1448"

This reverts commit fac9bdc.

containers/plantuml/.devcontainer/Dockerfile

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+#-----------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See LICENSE in the project root for license information.
+#-----------------------------------------------------------------------------------------
+
+FROM openjdk:8
+
+# Install git, process tools
+RUN apt-get update && apt-get -y install git procps
+
+# Install GraphViz
+RUN apt-get install -y graphviz
+
+# Clean up
+RUN apt-get autoremove -y \
+    && apt-get clean -y \
+    && rm -rf /var/lib/apt/lists/*
+

containers/plantuml/.devcontainer/devcontainer.json

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+{
+    "name": "PlantUML",
+    "dockerFile": "Dockerfile",
+    "extensions": [
+        "jebbs.plantuml"
+    ]
+}

containers/plantuml/.npmignore

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+README.md
+test-project
+.vscode
+.npmignore

containers/plantuml/README.md

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+# PlantUML
+
+## Summary
+
+*Demonstrates using PlantUML local rendering without installing dependencies. Includes Java, GraphViz, and the PlantUML extension.*
+
+| Metadata | Value |  
+|----------|-------|
+| *Contributors* | The VS Code Team |
+| *Definition type* | Dockerfile |
+| *Languages, platforms* | PlantUML |
+
+## Usage
+
+[See here for information on using this and other definitions in your project](../../README.md#using-a-definition). There are no addtional steps required.
+
+### Try it
+
+1. Run **Remote-Container: Open Folder in Container...** in VS Code and select a cloned copy of this entire folder.
+2. The container will build and VS Code will connect.
+3. Open `sample.plantuml` in the `test-project` folder and hit Alt-D.
+
+## License
+
+Copyright (c) Microsoft Corporation. All rights reserved.
+
+Licensed under the MIT License. See [LICENSE](../../LICENSE).

containers/plantuml/test-project/markdownsample.md

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+# Markdown Sample
+
+Open the markdown preview to check it out!
+
+## Code
+```
+@startuml
+legend
+    VS Code can do that?
+end legend
+VisualStudioCode -> Agent: openFolder(path)
+Agent -> ExtensionHost: installExtensions
+ExtensionHost -> ExtensionHost: download
+ExtensionHost -> ExtensionHost: install
+ExtensionHost -> Agent: return true
+Agent -> VisualStudioCode: return true@enduml
+```
+
+## Diagram
+```plantuml
+@startuml
+legend
+    VS Code can do that?
+end legend
+VisualStudioCode -> Agent: openFolder(path)
+Agent -> ExtensionHost: installExtensions
+ExtensionHost -> ExtensionHost: download
+ExtensionHost -> ExtensionHost: install
+ExtensionHost -> Agent: return true
+Agent -> VisualStudioCode: return true
+@enduml
+```

containers/plantuml/test-project/sample.plantuml

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+# Hit Alt-D preview me!
+@startuml
+title First Diagram
+legend
+    VS Code can do that?
+end legend
+VisualStudioCode -> Agent: openFolder(path)
+Agent -> ExtensionHost: installExtensions
+ExtensionHost -> ExtensionHost: download
+ExtensionHost -> ExtensionHost: install
+ExtensionHost -> Agent: return true
+Agent -> VisualStudioCode: return true
+@enduml
+
+@startuml
+title Second Diagram
+legend
+    VS Code can do that?
+end legend
+VisualStudioCode -> Agent: installWorkspaceExtension(id)
+Agent -> ExtensionHost: installExtension(id)
+ExtensionHost -> ExtensionHost: download
+ExtensionHost -> ExtensionHost: install
+ExtensionHost -> Agent: return true
+Agent -> VisualStudioCode: return true
+@enduml