Added license header to source files #123

Job	Run time
Code Style	1m 21s
Get minimum supported rust version	13s
SDK docs - mgmt	22s
Lint	30s
SDK docs	1m 22s
SDK docs - svc	26s
E2E Tests (stable, false)	31s
WASM Tests (stable, false)	1m 1s
E2E Tests (1.76, false)	41s
SDK Tests (stable, false)	3m 26s
WASM Tests (1.76, false)	1m 6s
E2E Tests (nightly, true)	48s
SDK Tests (1.76, false)	3m 34s
WASM Tests (nightly, true)	1m 7s
SDK Tests (nightly, true)	3m 7s
	19m 35s

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