[Indexer/TiDB][EASY] Add pre-requisites to README. #67851

Job	Run time
diff	9s
license-check	1m 11s
test (ubuntu-ghcloud)	25m 55s
release-notes-check	12s
move-auto-formatter-ci-test	0s
test-extra (ubuntu-ghcloud)	12m 51s
windows-build (windows-ghcloud)	17m 53s
simtest	13m 44s
move-test	0s
test	0s
cargo-deny (advisories, licenses, bans, ...)	3m 13s
clippy	6m 55s
graphql-rpc	20m 59s
rustfmt	19s
cutting a new execution layer	1m 32s
test-extra	0s
bridge-evm-tests	0s
	1h 44m 53s

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