Add Maven Central badge to README (#1254) #156

Job	Run time
Rust SDK Tests (windows-latest)	11m 23s
Rust SDK Bundled CLI Build (macos-latest)	3m 17s
Rust SDK Bundled CLI Build (ubuntu-latest)	3m 32s
Rust SDK Bundled CLI Build (windows-latest)	3m 11s
Rust SDK Tests (macos-latest)	4m 38s
Rust SDK Tests (ubuntu-latest)	5m 37s
	31m 38s

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