Update readme and license #3596

Job	Run time
coverage (ubuntu-20.04)	4m 51s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 2s
alpine 3.16.0 (musl)	15m 30s
Ubuntu/Debian packaging (Ubuntu 20.04)	5m 46s
ubuntu-20.04 (package, non-mavsdk_server)	6m 29s
android-arm	5m 25s
ubuntu-22.04 (package, non-mavsdk_server)	5m 31s
linux-armv6	4m 52s
android-arm64	5m 31s
linux-armv6-musl	11m 57s
linux-armv7	4m 53s
linux-armv7l-musl	11m 45s
ios	12m 37s
ios_simulator	11m 56s
linux-arm64	5m 3s
linux-arm64-musl	12m 28s
android-x86	5m 12s
macOS	18m 9s
ubuntu-20.04 (mavsdk, hunter)	3m 52s
ubuntu-22.04 (style and proto check)	1m 12s
macOS-framework	11m 5s
ubuntu-20.04 (mavsdk_server, superbuild)	11m 27s
android-x86_64	5m 16s
Windows	10m 41s
ubuntu-22.04 (mavsdk_server, superbuild)	9m 46s
iOS XCFramework	1m 0s
	3h 27m 16s

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