add license for BCS (#42)

add license for BCS

Signed-off-by: Aly, Walid <[email protected]>

docs/attribution.md

@@ -1,5 +1,11 @@
 # Intel® Tiber™ Broadcast Suite
 
+> **Warning:**
+>
+> FFmpeg is an open source project licensed under LGPL and GPL. See https://www.ffmpeg.org/legal.html.
+> You are solely responsible for determining if your use of FFmpeg requires any additional licenses. 
+> Intel is not responsible for obtaining any such licenses, nor liable for any licensing fees due, in connection with your use of FFmpeg.
+
 This application uses Open Source components. You can find the source code of their open source projects along with license information below. We acknowledge and are grateful to these developers for their contributions to open source.
 
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