Added apache license

Signed-off-by: Fredrik Skogman <kommendorkapten@github.com>

protos/envelope.proto

@@ -1,4 +1,207 @@
 // https://raw.githubusercontent.com/secure-systems-lab/dsse/9c813476bd36de70a5738c72e784f123ecea16af/envelope.proto
+
+//                               Apache License
+//                         Version 2.0, January 2004
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+
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+
 syntax = "proto3";
 
 package io.intoto;