Add PR review policy #1615

Job	Run time
Build & test (plutus-cbor)	56s
Build haddock using nix	3m 1s
Build & test (plutus-merkle-tree)	1m 5s
Build & test (hydra-plutus)	58s
Build & test (hydra-tui)	2m 30s
Benchmarks (hydra-node, tx-cost, --output-directory $(pwd)/../benchmarks)	10m 53s
Build & test (hydra-node)	5m 3s
Benchmarks (hydra-node, micro, -o $(pwd)/../benchmarks/ledger-bench.html)	1m 26s
Build & test (hydra-cluster)	10m 8s
Benchmarks (hydra-cluster, bench-e2e, datasets datasets/3-nodes.json datasets/1-node.json --outpu...	3m 41s
Benchmarks (plutus-merkle-tree, on-chain-cost, $(pwd)/../benchmarks)	1m 27s
Build specification using nix	41s
Publish test results	17s
Documentation	1m 30s
Publish benchmark results	7s
	43m 43s

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