docs(harper.js): added more detailed and beginner-friendly documentat… #137

Job	Run time
Release harper-ls - Windows-x86_64	3m 5s
Release harper-ls - macOS-x86_64	1m 28s
Release harper-ls - macOS-aarch64	1m 43s
Release harper-ls - Linux-x86_64-GNU	1m 29s
Release harper-ls - Linux-aarch64-GNU	2m 2s
Release harper-cli - Windows-x86_64	3m 21s
Release harper-cli - macOS-x86_64	1m 1s
Release harper-cli - macOS-aarch64	59s
Release harper-cli - Linux-x86_64-GNU	55s
Release harper-cli - Linux-aarch64-GNU	1m 15s
	17m 18s

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