[GR-15166] GraalVM Visual Studio Code extensions added.

vscode/.gitignore

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+*/dist
+*/out
+*/node_modules
+*/.vscode-test/
+*/*.vsix

vscode/README.md

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+# Visual Studio Code extensions
+
+This suite provides extensions to Visual Studio Code that support development of polyglot applications using GraalVM.
+
+## Build VSIX packages from sources
+
+To build VSIX packages of the GraalVM extensions, take the following steps:
+
+* Install `vsce` (short for "Visual Studio Code Extensions"), a command-line tool for packaging, publishing and managing VS Code extensions
+```bash
+npm install -g vsce
+```
+
+* Compile and package all extensions
+```bash
+cd graalvm; npm install; vsce package
+cd graalvm-r; npm install; vsce package
+cd graalvm-ruby; npm install; vsce package
+```
+
+## Installation
+
+To install the GraalVM extensions into Visual Studio Code, take the following steps:
+
+* Install each package with `code --install-extension <extension.vsix>`
+```bash
+code --install-extension graalvm-0.0.1.vsix
+code --install-extension graalvm-r-0.0.1.vsix
+code --install-extension graalvm-ruby-0.0.1.vsix
+```
+