templates/parachain: add polkadot wiki reference in README #5023

Job	Run time
preflight / preflight	43s
preflight / ci-versions	1m 10s
cargo-check-benches (master)	21m 9s
cargo-check-benches (current)	21m 36s
test-full-crypto-feature	2m 43s
test-frame-ui	45m 52s
cargo-check-each-crate (1)	18m 42s
test-node-metrics	8m 33s
cargo-check-each-crate (2)	19m 20s
cargo-check-each-crate (3)	8m 38s
cargo-check-each-crate (4)	16m 47s
cargo-check-all-crate-macos	12m 29s
cargo-check-each-crate (5)	24m 13s
cargo-check-each-crate (6)	14m 32s
cargo-check-each-crate (7)	28m 2s
test-frame-examples-compile-to-wasm	3m 4s
check-tracing	2m 24s
node-bench-regression-guard	13s
test-deterministic-wasm	6m 27s
check-metadata-hash	6m 24s
All test misc tests passed	1s
	4h 23m 2s

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