Adding Prerequisites to README #294

Job	Run time
Formatting Check	23s
Build and test (windows-latest, openssl_1.1)	16m 19s
Build and test (windows-latest, openssl_3)	25m 21s
Build and test (windows-latest, boringssl)	14m 27s
Build and test (ubuntu-latest, openssl_1.1)	5m 26s
Build and test (ubuntu-latest, openssl_3)	7m 44s
Build and test (ubuntu-latest, boringssl)	8m 31s
Build and test (macos-latest, openssl_1.1)	7m 6s
Build and test (macos-latest, openssl_3)	9m 54s
Build and test (macos-latest, boringssl)	9m 32s
Interop test	18m 12s
Build with clang-tidy (openssl_1.1)	10m 21s
Build with clang-tidy (openssl_3)	10m 37s
Build with clang-tidy (boringssl)	8m 59s
	2h 32m 52s

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