docs(readme): Add additional recommended specs for running a node #101

Job	Run time
geth (linux/amd64)	2m 59s
reth (linux/amd64, jemalloc,asm-keccak,optimism)	38s
geth (linux/arm64)	31m 50s
reth (linux/arm64, jemalloc,optimism)	45s
	36m 12s

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