readthedocs: Add the configuration file. #2346

Job	Run time
dpdk gcc	7s
linux rpm fedora	9m 7s
osx clang --disable-ssl	3m 54s
linux deb no dpdk	7m 1s
linux gcc --disable-ssl	4m 7s
linux clang --disable-ssl	3m 55s
linux gcc c99	3m 11s
linux clang c99	3m 46s
linux gcc test	12m 33s
linux clang test asan	21m 54s
linux clang test ubsan	13m 46s
linux gcc test --enable-shared	15m 52s
linux clang test --enable-shared	17m 25s
linux gcc test dpdk	13m 55s
linux clang test dpdk	10m 42s
linux gcc test -ljemalloc	13m 45s
linux clang test -ljemalloc	10m 55s
linux gcc --enable-afxdp	3m 55s
linux clang --enable-afxdp	4m 10s
linux gcc dpdk --enable-shared	6m 55s
linux clang dpdk --enable-shared	4m 56s
linux gcc dpdk-shared	4m 15s
linux clang dpdk-shared	4m 26s
linux gcc dpdk-shared --enable-shared	4m 40s
linux clang dpdk-shared --enable-shared	5m 6s
linux gcc m32 --disable-ssl	3m 58s
	3h 28m 16s

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