Adding Prerequisites to README #293

Job	Run time
Formatting Check	23s
Build and test (windows-latest, openssl_1.1)	10m 17s
Build and test (windows-latest, openssl_3)	10m 10s
Build and test (windows-latest, boringssl)	10m 15s
Build and test (ubuntu-latest, openssl_1.1)	5m 19s
Build and test (ubuntu-latest, openssl_3)	7m 33s
Build and test (ubuntu-latest, boringssl)	8m 48s
Build and test (macos-latest, openssl_1.1)	10m 29s
Build and test (macos-latest, openssl_3)	10m 6s
Build and test (macos-latest, boringssl)	10m 33s
Interop test	0s
Build with clang-tidy	0s
	1h 23m 53s

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