readme: provides initial instructions

Author: anthonydmays

README.md

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+# Language Workbench
+
+[![Open in Dev Containers](https://img.shields.io/static/v1?label=Dev%20Containers&message=Open&color=blue&logo=visualstudiocode)](https://vscode.dev/redirect?url=vscode://ms-vscode-remote.remote-containers/cloneInVolume?url=https://github.com/anthonydmays/language-workbench)
+
+### Purpose
+Provides blank projects in several languages used to demonstrate coding language features.
+
+### Installation
+1. Install VS Code and Docker. You can references the [instructions here][dev-container-instructions], if needed.
+1. Click the `Dev Containers` button above to automatically clone and open the project in a new dev container.
+   
+[dev-container-instructions]: https://aka.ms/vscode-remote/containers/getting-started