docs(readme): Add additional recommended specs for running a node #102

Job	Run time
geth (linux/amd64)	3m 26s
reth (linux/amd64, jemalloc,asm-keccak,optimism)	41s
geth (linux/arm64)	31m 52s
reth (linux/arm64, jemalloc,optimism)	49s
	36m 48s

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