docs: Include the 'CONTRIBUTING.md' explanation. #35

Job	Run time
Runtime / Deno Lint	9s
Compiler / Lint and Check	25s
CLI / Lint and Check	1m 6s
Compiler / Test and Release	1m 8s
CLI / Release (aarch64-unknown-linux-musl)	3m 30s
CLI / Release (x86_64-apple-darwin)	3m 46s
CLI / Release (aarch64-apple-darwin)	4m 57s
CLI / Release (x86_64-unknown-linux-musl)	2m 34s
Runtime / Deno Test	29s
Std / math	1m 17s
Std / json	1m 21s
Host / dom	24s
Std / test	50s
Host / storage	33s
Host / network	35s
Host / time	33s
Std / re	1m 23s
CLI / Test	1m 59s
Cloudflare Upload (CDN)	30s
Docs / Build	58s
Demo	34s
Docs / Deploy	26s
	29m 27s

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