Initialize VSCode extension for Arduino.

[yaohaizh]

@akaroml @adashen @andxu @Eskibear @jdneo @testforstephen

[msftclas]

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[akaroml]

Why using tab instead of space here?

[yaohaizh]

Copy from VSCode/go-vscode styles. Will use space as agreed.

[akaroml]

Great start! Just the coding style of using tab instead of space. I remember we had a vote inside the team. And space was preferred.