Document image attachment support in SDK READMEs #304

Job	Run time
Node.js SDK Tests (macos-latest)	59s
.NET SDK Tests (ubuntu-latest)	1m 27s
Node.js SDK Tests (windows-latest)	1m 36s
Python SDK Tests (ubuntu-latest)	26s
.NET SDK Tests (windows-latest)	2m 12s
Node.js SDK Tests (ubuntu-latest)	40s
Go SDK Tests (ubuntu-latest)	1m 7s
Python SDK Tests (macos-latest)	23s
Go SDK Tests (windows-latest)	2m 28s
Go SDK Tests (macos-latest)	1m 9s
.NET SDK Tests (macos-latest)	1m 3s
Python SDK Tests (windows-latest)	50s
	14m 20s

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