CICD

Add installation guide to VS Code Extension readme #1464

Job	Run time
Extract crate metadata	3s
WASM version	2m 16s
Ensure 'cargo fmt' has been run	8s
Documentation checks	6m 51s
Package vscode extension	8s
Minimum supported rust version	2m 10s
aarch64-unknown-linux-gnu (ubuntu-20.04)	4m 35s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	3m 44s
arm-unknown-linux-musleabihf (ubuntu-20.04)	4m 43s
i686-pc-windows-msvc (windows-2019)	9m 34s
i686-unknown-linux-gnu (ubuntu-20.04)	3m 46s
i686-unknown-linux-musl (ubuntu-20.04)	3m 54s
x86_64-apple-darwin (macos-13)	4m 41s
aarch64-apple-darwin (macos-15)	2m 16s
x86_64-pc-windows-msvc (windows-2019)	8m 20s
x86_64-unknown-linux-gnu (ubuntu-20.04)	3m 21s
x86_64-unknown-linux-musl (ubuntu-20.04)	3m 57s
	1h 4m 27s

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