Build

Add docs and release badges to README #743

Job	Run time
linux-x86_64	1m 49s
macos-x86_64	59s
linux (i386, i686, i686-linux-gnu, i386-linux-gnu)	1m 12s
linux-x86_64-autotools	1m 45s
linux (armhf, armhf, arm-linux-gnueabihf, arm-linux-gnueabihf)	1m 12s
linux (arm64, aarch64, aarch64-linux-gnu, aarch64-linux-gnu)	1m 14s
macos-x86_64-autotools	51s
mingw (mingw64, x86_64)	3m 35s
msvc (x86, Win32)	2m 10s
mingw (ucrt64, ucrt-x86_64)	3m 47s
mingw (clang64, clang-x86_64)	2m 44s
msvc (x64, x64)	2m 23s
msvc (arm64, ARM64)	2m 15s
	25m 56s

Provide feedback